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word. IMO the car sounds and runs the best with primary cats. I modified my stock ones. For headers, one of my best mods, was to add cats to the headers. I have an M6, the autos seem to function / sound better with primary cat deletes. Mine sounded like hollow cans banging around...
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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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