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I did some mods to the existing exhaust on my 2010 35i X6. First, I replaced the valve on the passenger side with a straight though pipe. I could have opened the valve and welded it open but I thought it would still cause some restrictions while there... I also experimented with taking off the resinator.....bad choice, car farted like a little Honda.... put that back on and took off the two last cats.... car sounds really good, no power loss, but not beefy enough sounding. I think I will be changing it all out for the Eissenman single exhaust tip (I like the single look).
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