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How much went into the design spec on these? I.e., diameter of the pipe vs. the length, engine speeds and turbo specifications? I am assuming that the manufacturer designed, tested, and refined these using CFD...LOL. The cross-bank manifold design of the S63tu is critical to the engine performance.
Good luck with those. I'll keep my "Barbie" stock exhaust manifolds, designed and manufactured by the good folks at Boysen.
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Current: '16 GT4
Past ///Ms:
'13 F10 M5, Alpine Weiss III/Sakhir Orange Full
'10 E60 M5, Space Gray/Black
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