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. **ITEM DISCONTINUED** |
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