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3-Series (E46, E90) Chat relating to the BMW 3-Series from 1999 to Current. Models include: BMW 316i, BMW 318i, BMW 318Ci, BMW 320i, BMW 323i, BMW 325i, BMW 330i, BMW 328 Ci, BMW 328i, BMW 325i/xi, BMW 330Ci, BMW 320d, BMW 330d, BMW 335d.

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Old 12-15-2003, 02:12 PM   #1 (permalink)
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Ok, so after talking with some Engineers and some of you on the forum, I've found out that just changing mufflers won't neccessarily yield any performance gains. I was told that the only way to get gains strictly with a muffler swap is if the muffler is the most restrictive point in the exhaust line. I have a 2000 323i and I'm not sure if anyone knows what the most restrictive point would be on my car. I'm asking because if I'd like to know what to replace in order to get the best performance gain, be it from manifold/headers, cats, or muffler, etc. Thanks!
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Old 12-15-2003, 11:40 PM   #2 (permalink)
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i believe thats true. change everything, including your intake system (CAI, throttle body, manifold , exhaust man, cats, and youll have a complete system that in theory should gain you more than any one or two components.
i think youll still lose bottom end but your mid and high range should gain.
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