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I have one on my car (stock N55 DP and Mid) - loud at cold start-up, but wife-approved for cruising around town and no drone on the highway. About 3000 rpm, it sounds great inside the car (still trying to figure out how to record good audio outside the car to insert into GoPro vids).
Good luck with the sale!
Cheers,
Bryan
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2011 135i M Sport | COBB V3 AP Stage 1+ | ER FMIC and CP | BMS OCC | Dinan Stage 3 Suspension | Dinan High Performance Bushing Kit | M3 Wishbones | Modified CDV | Clutch Stop | APEX EC-7 Wheels w/ Michelin PSS 235/40R18 265/35R18 Tires | Maddad Street Series Exhaust | BMW Performance Kidney Grills | LCI Blacklines | Armrest Delete | Spoiler Delete | 28% Tint
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