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"get rid of the CA emission crap"... Pretty much all cars sold in the US now are "50 state emissions legal". It means they all comply with CARB. It isn't "CA emissions crap" it is all states emission crap since everyone now follows the clear air act.
There are 4 cats which I think is what you are talking about. No licensed muffler or performance shop will take out cats as they don't want to be fined or have their license revoked. If you find one, pay cash. You might be able to trailer your car there and convince them it is a race car.
Putting a JB4 in (map2) with 93 oct fuel will yield much more HP than taking out cats. Buy the BMS exhaust or the BMW Mperf exhuast and the JB4. It will sound more aggressive and be faster.
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2015 F82 M4 Yas Marina & Full SS - All pkg/opts but CCB. Xpel - All painted surfaces
MPerf Electronic steering wheel, MPerf pedals, IND (reflectors, vents, grill, engine cover), Carbon Fiber (side marker, seat backs, shifter surround, e-Brake, rear spoiler).
Pure S2 turbos, MPerf Exhaust, Akrapovic DPs, BM3 (Cary Jordan 657rwhp+), H&R springs, 20" AvantGarde rims
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