Thread: ISF Exhaust?
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      05-08-2012, 04:48 PM   #10
LucWerkz
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Quote:
Originally Posted by saeedg48 View Post
it's a rpm sensitive valvetronic system.
Quote:
Originally Posted by brandonwuwux3 View Post
its the intake when you hit a certain rpm in the isf
Do you guys know of any aftermarket parts for the M3 that can do this?