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3D design do one. And some japanese company that I saw a vid of on youtube that sounded nicely aggressive.
One of things I factored into the purchase of the Z4 was my need for a louder & more exotic exhaust note. The 35is already comes with an upgraded exhaust so in effect it 'saved' me the $3000+labour+hassle to deliver and fit a quality aftermarket exhaust from overseas. I wonder how much that would be to buy from the dealer?
Do BMW performance do one yet?
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