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I've done some digging around...and (someone correct me if I'm wrong) that the M-Performance Exhaust (available in various websites for $2750 or so) is the exhaust that is on the X5M (not the X5 M50i). I know that with previous exhaust upgrades I've had (Dinan 540, Audi AWE), there was a slight performance boost with the new exhaust...
Does anyone know if there is any sort of HP/Torque boost w/the M-Performance Exhaust?
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