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I feel that on a M6 and the factory suitcase muffler, any removal of the front cats cause sound resonance issues. This seems to be made worst by LT with no cats. For some reason this is a unique combination, know not to work: M6, front cat removal and factory suitcase muffler.
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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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