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there have been dynos out, as a surprise there does not seem much loss for the 2" header on the low end, not much gain on the top end. Of course this is WOT. For 99.99% of the people I think the 1 and 7/8 will be enough. Only on max build NA or FI above 700 WHP could I see the 2" with a no cat 3" exhaust system. Below that it is bench racing and matters little IMO, given this the 1 and 7/8 just has less draw backs. For an M6 I recommend only a 1 and 7/8 with cats for all builds period.
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Forged short block, large duration sub .600 lift Cam Motion cam, 7200 RPM fuel cut, Pray Ported Heads, 3.85 pulley D1X, stage II intercooler, DSX secondary low side, DSX E85 sensor, Lingenfelter big bore 2.0 pump, ported front cats, 60608 Borla, LT4 injectors, ZL1 1LE driveshaft and Katech ported TB, ported MSD intake, BTR valvetrain, ARP studs, ProFlow valves, PS4 tires.
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