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Solidjake · 06-24-2019, 04:47 PM

Exhaust pipe flap/valve in the back (search it's been discussed many many times and most likely that's it) if not the turbo wastegate.

06-24-2019, 04:47 PM	#8
Solidjake ¯\_(ツ)_/¯ 949 Rep 1,762 Posts Drives: '13 328i Msport 6MT Join Date: Jun 2009 Location: NYC/SNJ iTrader: (2)	Exhaust pipe flap/valve in the back (search it's been discussed many many times and most likely that's it) if not the turbo wastegate. __________________ Tensioner/belt DIY \| Side skirt extension DIY Apex SM-10/DWS06+ \| 400m/X-ice Xi3 \| Injen Exhaust \| Stoptech SS Lines \| 335 Front Brakes Hawk HPS 5.0 \| RBF600 \| ER Charge Pipes \| Wagner Evo Comp 2 FMIC
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