Racing Spec IV uses the same basic principle as used in all racing spec muffler: straight, light weight and efficient exhaust flow. The Racing Spec IV muffled has however an additional built in silencer, making quieter then the the Spec III and and Pro Spec muffler. Adopting the main pipe which forms the muffler all 1mm thick SUS 304 stainless steel. In addition, the shell public wall adopts the 0.8 mm thick SUS 304 stainless steel and super light weight actualizes high endurance. Our Racing Spec IV exhaust system features an angle cut and rolled tip with our racing insignia proudly placed on the silencer making this something you can be truly be proud to own.

Under cruising conditions or when your engine is not being pushed to its limits, exhaust flow spreads further out and into the special packing material in our silencer due to our unique design. Under high performance conditions on the other hand, exhaust flow maintains a straight flow and exits our Racing Spec IV system without being obstructed by chambers or being forced through silencing materials.