These HPI (now aquapowerltd.com) model 9060-PR mufflers for 4" exhaust are very clean and in excellent condition. The internal flappers are intact on three mufflers. 4th is with muffler needs rod welded. Work well with high horsepower applications w/out robbing power. Call, text or email 402-290-8070. $500.00 + the ride.