Electronic Valve Controlled Exhaust Muffler Fits 09-17 Nissan GT-R R35Agency Power set out to produce the best exhaust system to appeal to the entire market. The solution is simple, create a high performance, quality built product with variable exhaust sound and performance. That is where this electronic valve controlled system thrives. The Agency Power muffler gives the user the ability to control the performance and sound of the exhaust with the push of a button. Valves mounted near the muffler allow exhaust gases to