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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** BC011 disclaimer | privacy policy | terms of sale Copyright 1999-2017 inlinefour.com Images are copyrighted to their respectful owners excluding those of inlinefour.com All rights reserved. Some images may vary from the actual product. Prices and terms subject to change without notice. Some products are intended for "off-road use" only and may not be legal on pollution controlled vehicles. Check your local and state laws for more info. Web design and image creation by inlinefour