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Originally Posted by Dieler
BMW make any factory authorized free flow exhaust?? Wouldn't want to harm the warranty but want to open her up a bit..
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I believe that the 325i contains a free flowing exhaust, but all 330is contain the valve control system. If you want you could purchase an after market exhaust, I have an eisenmann one, which is free flowing. It has a pretty nasty exhaust note, the video is located below my post. But, be warned, I have got a ticket for having the eisenmann installed because it amplifies the sound of the exhaust. I thought it was bullshit. I guess the cop didnt have better things to do then give me a ticket for an after market exhaust.