{"product_id":"infinity-design-bmw-s85-e60-m5-e63-m6-100-equal-length-headers","title":"Infinity Design BMW S85 E60 M5 \/ E63 M6 100% Equal Length Headers","description":"\u003ch2\u003e\u003cspan\u003eInfinity Design V4 Equal Length Headers – BMW E90 \/ E92 \/ E93 M3 S65\u003c\/span\u003e\u003c\/h2\u003e\n\u003cp\u003e\u003cspan\u003eThe \u003c\/span\u003e\u003cstrong\u003e\u003cspan\u003eInfinity Design V4 Equal Length Header\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e represents the latest evolution of one of the most proven exhaust manifold designs available for the BMW E9X M3 S65 V8.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eBuilding on the worldwide success of the V3, which has repeatedly demonstrated \u003c\/span\u003e\u003cstrong\u003e\u003cspan\u003e30–40 hp gains on independently tested vehicles around the world\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e, the V4 isn't about chasing a larger headline horsepower figure.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eInstead, Infinity Design returned to the design and manufacturing process with a different objective:\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003e\u003cspan\u003eTo perfect every aspect of the S65 equal-length header.\u003c\/span\u003e\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eThe result is a completely refined design incorporating \u003c\/span\u003e\u003cstrong\u003e\u003cspan\u003etrue equal-length 730 mm primary pipes, stepped primary diameters, significantly enlarged F1-style collectors, CNC-machined transition flanges and improved installation access\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eDesigned using detailed 3D scanning and CAD modelling before being manufactured entirely within Infinity Design's own facility, the V4 has been engineered for everything from standard 4.0-litre S65 engines through to extreme \u003c\/span\u003e\u003cstrong\u003e\u003cspan\u003e5.5- and 5.8-litre builds\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e.\u003c\/span\u003e\u003c\/p\u003e\n\u003ch3\u003e\u003cspan\u003eBuilding on the Proven V3\u003c\/span\u003e\u003c\/h3\u003e\n\u003cp\u003e\u003cspan\u003eThe previous Infinity Design V3 header established an exceptional track record on the S65 platform.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eAcross numerous vehicles and independent dynamometers around the world, the V3 has consistently demonstrated gains in the region of:\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003e\u003cspan\u003e+30–40 hp\u003c\/span\u003e\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eInfinity Design doesn't expect the V4 to produce additional peak power over an optimised V3 installation.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eThat wasn't the objective.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eInstead, the V4 focuses on refining \u003c\/span\u003e\u003cstrong\u003e\u003cspan\u003eprimary length, internal volume, collector design, port transitions, exhaust tone, manufacturing quality, installation and future capacity for larger-displacement S65 builds\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eIt's an evolution based on engineering refinement rather than marketing a larger dyno number.\u003c\/span\u003e\u003c\/p\u003e\n\u003ch3\u003e\u003cspan\u003e100% Equal-Length Primaries\u003c\/span\u003e\u003c\/h3\u003e\n\u003cp\u003e\u003cspan\u003eOne of the most significant developments is the move to \u003c\/span\u003e\u003cstrong\u003e\u003cspan\u003etrue equal-length primary pipes\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eThe V3 was already extremely close – sufficiently so to be considered equal length by normal automotive engineering standards.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eFor the V4, Infinity Design took this one step further.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eEvery primary now has a \u003c\/span\u003e\u003cstrong\u003e\u003cspan\u003e730 mm centre-radius length\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e, creating a genuinely equal path from each cylinder head exhaust port to the collector.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eThis helps maintain consistency in exhaust pulse timing between cylinders and further refines the characteristics of the S65 exhaust system.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eThe change also has an effect on sound.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eCompared with the previous design, the V4 produces a \u003c\/span\u003e\u003cstrong\u003e\u003cspan\u003eslightly smoother and more harmonised exhaust tone\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e, complementing the S65's naturally aspirated V8 character.\u003c\/span\u003e\u003c\/p\u003e\n\u003ch3\u003e\u003cspan\u003eStepped Primary Design\u003c\/span\u003e\u003c\/h3\u003e\n\u003cp\u003e\u003cspan\u003ePrimary pipe dimensions have also been revised.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eThe V3 used a \u003c\/span\u003e\u003cstrong\u003e\u003cspan\u003e41.7 mm primary\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e, while the V4 begins at \u003c\/span\u003e\u003cstrong\u003e\u003cspan\u003e42 mm\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e before stepping to \u003c\/span\u003e\u003cstrong\u003e\u003cspan\u003e45 mm approaching the collector\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eThis progressive increase in diameter provides additional internal volume as exhaust gases move downstream.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eThe objective is to maintain exhaust-gas velocity closer to the cylinder head while providing increased flow capacity as the gases approach the collector.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eThis becomes increasingly important as engine airflow and displacement increase.\u003c\/span\u003e\u003c\/p\u003e\n\u003ch3\u003e\u003cspan\u003eDeveloped for 4.0L to 5.8L S65 Builds\u003c\/span\u003e\u003c\/h3\u003e\n\u003cp\u003e\u003cspan\u003eThe increased overall volume of the V4 isn't intended only for heavily modified engines.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eThe system remains suitable for standard-displacement S65s and vehicles fitted with conventional bolt-on performance upgrades.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eHowever, the additional capacity also gives the header considerably more scope for the increasingly popular \u003c\/span\u003e\u003cstrong\u003e\u003cspan\u003elarge-displacement S65 engine builds\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eThis includes applications from the standard \u003c\/span\u003e\u003cstrong\u003e\u003cspan\u003e4.0-litre S65\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e through stroker configurations such as:\u003c\/span\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cstrong\u003e\u003cspan\u003e4.4L\u003c\/span\u003e\u003c\/strong\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cstrong\u003e\u003cspan\u003e4.6L\u003c\/span\u003e\u003c\/strong\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cstrong\u003e\u003cspan\u003e5.0L\u003c\/span\u003e\u003c\/strong\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cstrong\u003e\u003cspan\u003e5.5L\u003c\/span\u003e\u003c\/strong\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cstrong\u003e\u003cspan\u003eUp to 5.8L applications\u003c\/span\u003e\u003c\/strong\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003cspan\u003eAs displacement increases, so does the volume of exhaust gas the engine needs to move.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eThe V4's increased primary and collector volume has therefore been engineered with both current and future S65 engine development in mind.\u003c\/span\u003e\u003c\/p\u003e\n\u003ch3\u003e\u003cspan\u003eLarger F1-Style Slip-On Collector\u003c\/span\u003e\u003c\/h3\u003e\n\u003cp\u003e\u003cspan\u003eThe V4 also introduces a substantially redesigned \u003c\/span\u003e\u003cstrong\u003e\u003cspan\u003eF1-style slip-on collector\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eBoth the overall length and internal volume have been increased, with the collector now constructed around the larger \u003c\/span\u003e\u003cstrong\u003e\u003cspan\u003e45 mm pipework\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eCollector design plays an important role in how individual exhaust pulses from each cylinder interact as they merge.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eCombined with the true equal-length primaries, the larger collector creates a carefully controlled transition as exhaust gases leave the individual primary pipes and enter the remainder of the exhaust system.\u003c\/span\u003e\u003c\/p\u003e\n\u003ch3\u003e\u003cspan\u003eCNC-Machined Cylinder Head Flanges\u003c\/span\u003e\u003c\/h3\u003e\n\u003cp\u003e\u003cspan\u003eAttention to airflow begins directly at the S65 cylinder head.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eThe V4 uses \u003c\/span\u003e\u003cstrong\u003e\u003cspan\u003eCNC-machined exhaust flanges\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e incorporating an internal transition from the engine's oval exhaust ports into the \u003c\/span\u003e\u003cstrong\u003e\u003cspan\u003e42 mm outside diameter primary pipes\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eRather than forcing exhaust gases through an abrupt change in shape, the internal taper creates a smooth transition between the cylinder-head port and tubular primary.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eThis attention to the beginning of the exhaust path is just as important as increasing pipe diameter further downstream.\u003c\/span\u003e\u003c\/p\u003e\n\u003ch3\u003e\u003cspan\u003eDesigned Using 3D Scanning \u0026amp; CAD\u003c\/span\u003e\u003c\/h3\u003e\n\u003cp\u003e\u003cspan\u003ePackaging eight long, genuinely equal-length primary pipes into the confined E9X M3 engine bay requires considerably more than conventional fabrication.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eInfinity Design began development using \u003c\/span\u003e\u003cstrong\u003e\u003cspan\u003edetailed 3D scans of the S65 engine and surrounding engine bay\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eThese scans were brought into CAD, allowing the position and routing of each primary to be developed accurately within the available space.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eThis digital development process makes it possible to optimise:\u003c\/span\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cspan\u003ePrimary length\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cspan\u003ePrimary routing\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cspan\u003eCollector positioning\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cspan\u003eEngine-bay clearance\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cspan\u003eCylinder-head access\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cspan\u003eInstallation requirements\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cspan\u003eOverall exhaust volume\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003cspan\u003eThe final geometry could therefore be established digitally before progressing into physical manufacture.\u003c\/span\u003e\u003c\/p\u003e\n\u003ch3\u003e\u003cspan\u003eDesigned \u0026amp; Manufactured In-House\u003c\/span\u003e\u003c\/h3\u003e\n\u003cp\u003e\u003cspan\u003eThe V4 isn't an outsourced product carrying an Infinity Design badge.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eThe headers are \u003c\/span\u003e\u003cstrong\u003e\u003cspan\u003edesigned and manufactured by Infinity Design within its own facility\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e, giving direct control over development, fabrication and final quality.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eFabrication uses high-end \u003c\/span\u003e\u003cstrong\u003e\u003cspan\u003eargon gas-purged welding with full penetration\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e, helping produce strong, clean and consistent welds throughout the system.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eFor a component subjected to extreme exhaust temperatures, vibration and repeated thermal cycling, manufacturing quality is every bit as important as the underlying geometry.\u003c\/span\u003e\u003c\/p\u003e\n\u003ch3\u003e\u003cspan\u003eImproved Installation \u0026amp; Serviceability\u003c\/span\u003e\u003c\/h3\u003e\n\u003cp\u003e\u003cspan\u003ePerformance wasn't the only consideration during the V4 redesign.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eOne of the major practical improvements is \u003c\/span\u003e\u003cstrong\u003e\u003cspan\u003ebetter access to the cylinder-head studs and retaining nuts\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eThe primary routing has been revised so that, when the correct fitting sequence is followed, all retaining nuts can be accessed using \u003c\/span\u003e\u003cstrong\u003e\u003cspan\u003enormal workshop tools\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eThis makes installation considerably more straightforward and reduces the need for specialist or modified tools simply to access the manifold hardware.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eIt's a small detail from a performance perspective, but an important one for the technicians actually installing and maintaining the system.\u003c\/span\u003e\u003c\/p\u003e\n\u003ch3\u003e\u003cspan\u003ePerformance\u003c\/span\u003e\u003c\/h3\u003e\n\u003cp\u003e\u003cspan\u003eThe V4 builds upon a header design already proven to produce substantial gains.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eIndependent testing of the previous V3 system across numerous S65 applications demonstrated consistent gains of approximately:\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003e\u003cspan\u003e+30–40 hp\u003c\/span\u003e\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eInfinity Design does \u003c\/span\u003e\u003cstrong\u003e\u003cspan\u003enot\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e claim that the V4 will make additional peak horsepower simply because it is the newer product.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eInstead, the V4 provides a more refined solution with:\u003c\/span\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cspan\u003eTrue equal-length primaries\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cspan\u003eGreater overall exhaust volume\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cspan\u003eLarger collectors\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cspan\u003eImproved port transitions\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cspan\u003eIncreased capacity for large-displacement engines\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cspan\u003eImproved installation\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cspan\u003eRefined exhaust tone\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003cspan\u003eFor us, this is a far more credible approach than redesigning an already successful product and automatically attaching a larger horsepower claim to it.\u003c\/span\u003e\u003c\/p\u003e\n\u003ch3\u003e\u003cspan\u003eKey Features\u003c\/span\u003e\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cstrong\u003e\u003cspan\u003eDeveloped specifically for the BMW E9X M3 S65 V8\u003c\/span\u003e\u003c\/strong\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cstrong\u003e\u003cspan\u003eLatest evolution of the proven V3 header\u003c\/span\u003e\u003c\/strong\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cstrong\u003e\u003cspan\u003eV3 independently demonstrated approximately 30–40 hp gains\u003c\/span\u003e\u003c\/strong\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cstrong\u003e\u003cspan\u003e100% equal-length primary design\u003c\/span\u003e\u003c\/strong\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cstrong\u003e\u003cspan\u003e730 mm centre-radius length for every primary\u003c\/span\u003e\u003c\/strong\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cstrong\u003e\u003cspan\u003e42 mm primary pipe diameter\u003c\/span\u003e\u003c\/strong\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cstrong\u003e\u003cspan\u003eStepped to 45 mm approaching the collector\u003c\/span\u003e\u003c\/strong\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cstrong\u003e\u003cspan\u003eLarger F1-style slip-on collectors\u003c\/span\u003e\u003c\/strong\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cstrong\u003e\u003cspan\u003eIncreased collector length and internal volume\u003c\/span\u003e\u003c\/strong\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cstrong\u003e\u003cspan\u003eCNC-machined cylinder-head flanges\u003c\/span\u003e\u003c\/strong\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cstrong\u003e\u003cspan\u003eInternal transition from oval exhaust port to round primary\u003c\/span\u003e\u003c\/strong\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cstrong\u003e\u003cspan\u003eDesigned using 3D engine and engine-bay scans\u003c\/span\u003e\u003c\/strong\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cstrong\u003e\u003cspan\u003eCAD-developed primary routing\u003c\/span\u003e\u003c\/strong\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cstrong\u003e\u003cspan\u003eDesigned and manufactured in-house\u003c\/span\u003e\u003c\/strong\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cstrong\u003e\u003cspan\u003eArgon gas-purged welding\u003c\/span\u003e\u003c\/strong\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cstrong\u003e\u003cspan\u003eFull-penetration welds\u003c\/span\u003e\u003c\/strong\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cstrong\u003e\u003cspan\u003eImproved cylinder-head stud access\u003c\/span\u003e\u003c\/strong\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cstrong\u003e\u003cspan\u003eInstallation possible using conventional workshop tools\u003c\/span\u003e\u003c\/strong\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cstrong\u003e\u003cspan\u003eSuitable for standard and modified S65 engines\u003c\/span\u003e\u003c\/strong\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cstrong\u003e\u003cspan\u003eDesigned to support large-displacement builds up to 5.8 litres\u003c\/span\u003e\u003c\/strong\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cstrong\u003e\u003cspan\u003eSmoother, more refined exhaust tone\u003c\/span\u003e\u003c\/strong\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003e\u003cspan\u003eManufacturing Lead Time\u003c\/span\u003e\u003c\/h3\u003e\n\u003cp\u003e\u003cspan\u003eEach V4 header system is manufactured at Infinity Design's own facility.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eAs of \u003c\/span\u003e\u003cstrong\u003e\u003cspan\u003eApril 2026\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e, customers should allow approximately a \u003c\/span\u003e\u003cstrong\u003e\u003cspan\u003esix-week manufacturing lead time\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eLead times can vary depending on production demand, so please contact PERON before ordering if you require the system for a specific build date or workshop booking.\u003c\/span\u003e\u003c\/p\u003e\n\u003ch3\u003e\u003cspan\u003eInfinity Design x PERON\u003c\/span\u003e\u003c\/h3\u003e\n\u003cp\u003e\u003cspan\u003eAt PERON, we work closely with \u003c\/span\u003e\u003cstrong\u003e\u003cspan\u003eInfinity Design\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e, supporting development through technical feedback, testing, datalogging and access to the \u003c\/span\u003e\u003cstrong\u003e\u003cspan\u003ePERON Technology Centre and our Dynojet 424x linked dyno facility\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eThe V4 Equal Length Header is exactly the type of product this relationship is built around.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eIt doesn't replace a successful V3 simply to claim a bigger horsepower number. Instead, it takes an already proven concept and improves the areas that matter from an engineering perspective – \u003c\/span\u003e\u003cstrong\u003e\u003cspan\u003eexhaust pulse consistency, flow capacity, collector design, manufacturing, installation and support for the next generation of high-capacity S65 engine builds\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eFor customers looking to extract the full naturally aspirated character and performance potential from the S65, the V4 represents Infinity Design's most developed equal-length header package to date.\u003c\/span\u003e\u003c\/p\u003e","brand":"Infinity Design","offers":[{"title":"Default Title","offer_id":57444752032119,"sku":"INF-S85-H-V4","price":3150.0,"currency_code":"GBP","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0649\/1897\/files\/Infinity_V4_Header_7_6634940b-6290-433e-a80e-ee5e229f8ad8.jpg?v=1788883771","url":"https:\/\/peron-automotive.co.uk\/products\/infinity-design-bmw-s85-e60-m5-e63-m6-100-equal-length-headers","provider":"PERON Automotive Ltd","version":"1.0","type":"link"}