All HKS exhaust systems are engineered with performance, quality, and value as primary goals. Through countless comprehensive efforts of flow analysis, dyno testing and tuning are we able to maximize horsepower gains throughout a broad powerband, while maintaining reasonable sound levels for street use. HKS Exhaust Systems that are designated for street use retain all factory emissions equipment and conform to the California Vehicle Code 95-decibel exhaust noise level limit. (Note: Some HKS exhaust systems are designated for Off-Road Use Only and are solely to be used for Off-Road purposes)
Each HKS Exhaust is vehicle specific. In some applications where multiple systems are offered, each system is even more specifically based on an applications level of tuning; e.g. Sport, Turbo, Drager, Hiper, and Racing systems, respectively, have increasing pipe diameter sizes and flow characteristics. Engine and chassis configurations are individually analyzed to ensure that each application is specifically tailored and not universalized. Each HKS system features high-quality mandrel bent, bake-coated aluminized steel piping, which allows for smooth consistent exhaust flow throughout the entire length of the system. Piping diameter is also crucial to the characteristics of exhaust flow and is specific per application. Because of the consistent pipe diameter in all the bend areas from the mandrel bending process (as opposed to the crimps or kinks from a press-bent process) there is less restriction and turbulence which increases exhaust flow velocity.
HKS exhausts systems are designed for direct bolt on fitment to the stock flanges and come with all the necessary gaskets and hardware to provide simple installation and long term durability. All HKS exhaust systems utilize a micro-fiber mesh sheet wrapping around the internals of the muffler tube to prevent muffler packing from escaping over time, thus increasing the durability of the system. HKS Full Stainless Steel exhausts system applications also now come with an extended 4-year warranty.