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		BMW 1 Series Coupe Forum / 1 Series Convertible Forum (1M / tii / 135i / 128i / Coupe / Cabrio / Hatchback) (BMW E82 E88 128i 130i 135i) > Technical / Specific Topics > 135i Turbo Engine (N54 / N55), Exhaust and Drivetrain Modifications
Secondary cats

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10-29-2011, 01:35 PM	#1
Castr_85M Captain 55 Rep 944 Posts Drives: AW/Fox 6MT E90 M3 Join Date: Sep 2009 Location: NYC iTrader: (7)	Secondary cats Will removing secondary cat yield any power gains? Current mods are Catless dp, dci, procede, and pwm on stock midpipes and axleback. __________________ E90 M3 AW/Extended FR•Ohlins•Borla•ACM•K&N•IND•BBS•Vredestein•Velos Designworks•Vorsteiner•BMW Performance•Lux AE•Arkym
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