Buy Akra and add BMW M-Performance Tips.
That's what I did.
Its more like weight saving, esthetic upgrade and the sound improvement.
I'm sure there is some power gains but with 500+ HP car, you will not notice low single digit gains..
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PAST: F80 M3 ZCP | 911.1 C2S | F10 M5 ZCP | E70 X5M | E90 M3 | E46 M3 | E36 M3
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