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If you want a loud one, SouthernBM has a full set of iPe Innotech F1 going which has butterfly valves. Closed sounds like Akra, but open is F1 as it says....
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BMW E86 Z4M MY07 - IB | ACS Carbon Rear Diffuser | ACS Sport Exhaust | ACS Rear Wing | GruppeM CAI - SOLD
BMW E92 M3 MY08 - AW | Akrapovic Evolution | aFe CAI | SBM Tune | Black ZCP | CF Details - SOLD
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