The Straightline Performance Full Stainless Steel Performance Header for all Yamaha Viper models delivers a proven 11 horsepower gain through improved exhaust flow efficiency and optimized exhaust pulse management. Featuring a true stainless steel merge collector, stainless flex connector, and premium full stainless construction, this header improves throttle response, acceleration, and overall power while providing outstanding durability and fit and finish. Even greater gains are available when combined with additional performance upgrades and tuning.