The WS Exhaust Series is the APEX answer to the ultimate street muffler system with all-round performance. The bushing is made of high-quality polished SUS304 stainless steel, while the mandrel curved pipes are made of high-strength titanium particle-coated mild steel. This muffler has always been the standard for aftermarket street exhaust systems. The oval bush includes a newly designed beaded tip for an extremely high quality finish. The interior construction has been refined for even more power in the low to mid-range segment. Numerous warehouse dyno tests have proven the WS exhaust to be one of the best exhaust systems on the market. As always, all APEX cat exhaust systems come complete with all necessary hangers, nuts, bolts and gaskets. For vehicles that want the high-quality, sporty look without too much noise.