no performance wise your looking at maybe 2-3hp nothing that you would ever notice, sound wise your car would sound a little different a bit deeper but once again its not like a performance exhaust really if anything if you buy it .. it will be more for the look
Furious is right on target. I installed an M3 catback in my 325i and did not notice any change in performance and didn't expect any. It has a nice civilized tone unlike a high performance catback system.
I love the stainless steel tips. These are not chrome covers, but solid stainless.
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.
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