1st Gear Member
Join Date: Sep 2004
Location: In the 916 with 925 digits
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As far as I know the 323 came with a single exhaust pipe(part of the engine detuning vs a 325). To fit a m3 muffler on it you need the cats along with the hole middle part too. If you get the hole m3 exhaust down from headers on your 323 you should get a notice in performance.
Ive also got a m3 muffler on my 325, sounds nice, looks 100000000000 times better than stock, performance wise: probably only seen on a dyno.