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ec1990 · 01-30-2013, 09:33 PM

Yep, it has two sets of butterfly valves, one to reduce drone, and one during high-revving which opens up all four exhaust outlets instead of just two.

01-30-2013, 09:33 PM	#24
ec1990 Drives: 2012 AGM SS Join Date: Jun 2012 Location: Las Vegas Posts: 1,407	Yep, it has two sets of butterfly valves, one to reduce drone, and one during high-revving which opens up all four exhaust outlets instead of just two.