go look for my post on my X6 upgrade [search my post]. I went with the Eissenman race for my 35i. Wasn't bad but get the large single pipes as the quad ones look different and after having it done...the dual large 120mm ones would be best. Can email you a sound clip and pics if you want otherwise check the post I did around July 2012. Good luck.
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'22 BMW M4 Comp (SSG/Black)
'16 BMW M4 (Shakir Orange/Black) - gone not forgotten
'15 BMW M3 (Black/Black) - gone not forgotten
'10 BMW X5M (Black/Black) - gone not forgotten
'08 BMW M3 (Space Gray/Black) - gone not forgotten
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