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We have had great success with our valvetronic exhausts for the M5, M6, GTR, and Ferrari 360. So we built one for my 997TT. It features a wireless solenoid activated switch that opens a valve in the exhaust to bypass the entire muffler system and become straight pipes out of the Quad Tips. Pretty cool and I love it 
YouTube - Porsche 997 Turbo with Valvetronic Street to Defeat Exhaust
Hope you enjoy!
YouTube - Porsche 997 Turbo with Valvetronic Street to Defeat Exhaust
Hope you enjoy!
