When it comes to quality/fitting nothing comes close to Akrapovic, I have the evolution system on my n55 335i and it is awesome. Have had many aftermarket systems previously such as hks/trust etc. but none of them come close to Akrapovic, downside is they are crazy expensive and do not sound all that loud if you do not have an aftermarket dump pipe to go along side with it.
Depends what you are after, the weight saving is amazing also.
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