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Sounds great! Mine goes on tomorrow! Now I'm excited. Since we are vendors on here my dealership is throwing one on my car for marketing purposes. To be honest though I don't believe that there is any power gains. I think it's just for a more aggressive sound. What I've noticed on the other BMW Performance and M Performance exhausts is that the casing is very close to stock with the internals being different to create the more aggressive sound. When I did my 135 BMW Performance exhaust there was no difference in weight or power just sound.
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