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With a unique bike like the Honda Grom, Two Brothers Racing has designed something special in the S1R exhaust. The innovative carbon fiber S1R exhaust will turn heads with a new design that has been developed to increase the horsepower by 10 percent and reduce weight by 5.5 pounds over the stock exhaust. The S1R is also fitted with a lightweight spiral wound perforated core and high performance sound absorption packing material. With noticeable horsepower gains, a lighter overall weight and that striking TBR sound, your Honda Grom will get noticed at the next Honda Grom Prix. Works with stock fender and TBR Fender Eliminator Kit.