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Originally Posted by dparm
The muffler is tuned to work with a given exhaust tubing length/diameter, configuration (bends, crossovers, etc), cats, headers, and so on. It's an exhaust system and just slapping that other muffler on there is not going to produce a very smooth sound, if I had to guess.
But hey, your money and your car.
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Somewhat true. Different exhausts use the same muffler... Not necessarily BMW, but just in general.
OP: how much was the f80/f82 OEM muffler?