I met a guy at Corvettes at Carlisle last year. He had a BB exhaust on his 02 4.4i. While it sounded good, there was a tinge at the top end. Just too rough for my taste. Otherwise is sounded good before 6K rpm.

Now I had a BB exhaust on my Twin Turbo and THAT sounded great!!!

I know you have a 3.0, but not many mod the X's this way. Most of what I've seen in mods is appearance and not performance.

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2011 E70 50i M Sport