HKS Hiper: Each HKS exhaust system is vehicle specific, designed for only a particular engine/vehicle configuration. Using extensive computer controlled flow analysis, dyno testing, and precision fitment design, HKS produces maximum horsepower without dramatically depleting low-end torque. Each HKS exhaust system is flanged and comes with all gaskets and hardware to provide the easiest direct bolt on installation possible. Additionally, HKS exhaust systems utilize factory mounting points and hanger locations and are 50 state emissions and sound legal. Rear section exhaust (not cat-back). Performance gain: +11RWHP