www.agency-power.com - The Agency Power Electronic Valve Controlled Exhaust for the BMW E63 M6 features the ability to change from a High Performance exhaust sound and power level to a more tame quiet exhaust level with the push of a button. The system used for this video is the header back variation that produced 46whp and 21 ft. lbs tq on the Vivid Racing Mustang II Dyno with the valves open. The exhaust system is a bolt on application with no changes to the ECU or other modifications needed.

www.agency-power.com - The brand new Agency Power Exhaust system for the Nissan R35 GT-R features electronic vacuum controlled bypass valves that allows the exhaust gases to flow past the muffler. This bypass gives the GT-R an unrestricted exhaust for unparalleled performance and sound. For every day driving, the bypass valves can be remotely switched via a wireless remote. With the valve closed, the exhaust gases flow through the muffler for a mild exhaust tone. With the bypass valve on, the car picked up nearly 50whp on the Vivid Racing dyno without any tuning or other modifications. With the bypass valve off and utilizing the muffler, the Agency Power exhaust still had a modest gain of ~20whp. This video is designed to show the cars exhaust sound with both the bypass valves on and off.