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ACM exhaust has 0 drone. I'm running AA race xpipe(Full Catless) and its still has VERY little drone inside the car. Basically ACM's method is like an eissenmann race and the perforated pipe method is the sport.
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E90 M3 AW/Extended FR•Ohlins•Borla•ACM•K&N•IND•BBS•Vredestein•Velos Designworks•Vorsteiner•BMW Performance•Lux AE•Arkym |