Thread: 540i exhaust
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Unread 06-04-2009, 03:02 PM   #5
Big Evil
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Name: Big Evil
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Join Date: Nov 2008
Location: Tempe, Az
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Your Ride: 1994 BMW 525i, 1987 325is, 1986 325
Maybe, generally as long as you remove something AFTER the cat and O2 sensors you don't really affect anything that the car can't compensate for. If you're worried though get a replacement like a flowmaster, not the greatest performance muffler ever made but it maintains the back pressure needed and gives you a GREAT exhaust note.
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