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Is the stock exhaust valve less?
What i did in my m5 competition is to keep the valve open all the time and its perfect.
I was going to buy the m performance but not sure its what i was looking. So i opened it and never closed it since then.
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03 e39M5 Imola Red-Tubi Exhaust/GROMAudio
16 F10 M5JavaGrun/MT/CP/CCB/B&O/ReaRDVD
23G82M4SignalGrun/MT/CCB/CarbonBuckets
09 Ferrari SCUDERIA Rosso Corsa
23CayenneGTSCoupe
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