Different weird noise at low RPM after MHD Flash Stage 1

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		BMW 1 Series Coupe Forum / 1 Series Convertible Forum (1M / tii / 135i / 128i / Coupe / Cabrio / Hatchback) (BMW E82 E88 128i 130i 135i) > Technical / Specific Topics > 135i Turbo Engine (N54 / N55), Exhaust and Drivetrain Modifications
Different weird noise at low RPM after MHD Flash Stage 1

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10-18-2015, 11:26 PM	#1
psamtik Involuntarily BMW 31 Rep 184 Posts Drives: 09 E82 135i Join Date: Oct 2014 Location: San Jose / Cupertino iTrader: (1)	Different weird noise at low RPM after MHD Flash Stage 1 After the stage 1 flash, the low RPM noise of the engine is most definetely different. It sounds buzzy and harsher when it drops below 600-700rpm. Is this normal? __________________ 1997 328i / sold 1999 M3 / sold 2009 135i / current
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