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M3 Exhaust Power Loss?



A few volumes back, someone (the name Michael comes to mind, but I'm not sure)
said that they had installed an M3 exhaust on their 325i and noticed a drop in
power... I thought that that was a good upgrade? If the car had a chip custom
tailored to the exhaust system, would that make a difference?

TIA

Matt
92 325is Sharked

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