I'll never run a pulley. Plenty of people here run then with no issues, but I know a guy who lost his built motor because of one. I have run them with no issues in the past, but when the guy who built my car told me specifically to never run a pulley because one of them destroyed his motor I listen.
Granted, that was on a turbo setup making 700whp, so any issue gets magnified. On a NA car I wouldn't expect any issues since the margin for error is much higher.
Honestly, if you want to lose rotating mass get a flywheel first.
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2011 MB Touring-Sport-6sp-Nav/GTM TT/FI TT TDX/JTran/Kosmic/Eibach/Hotchkis/SPC/CSF/RPS/SoThatsWhereAllMyMoneyWent
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