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without cats, the m6 needs to be at 67 MPH to be happy in 6th, that for many people is an issue. I have a single tip exhaust. My low engine speed drivability does not seem TB dependent I have 3 (103mm, ported stock, stock). It is directly related to having front cats both with CA front cat deletes and with LT headers.
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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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