HKS cat-back exhaust system is developed to improve your torque and horsepower.


Full 3 inch cat-back with a great deep throaty sound. Adds HP and increased throttle response. Piping is mandrel bent with a stainless steel muffler and includes a bung for the 02 sensor.

Sound: Low deep growling sound. Provides a loud tone under acceleration, moderately quite at idle.

Fits: MazdaSpeed3