Kawasaki Ninja 650 8" Mini Carbon Fiber Round Muffler Exhaust Slip On 09 10 11 ER-6N ER650C (2009-2011) Mini 8" carbon fiber mufflers are manufactured from a preformed carbon fiber sleeve and high grade 304 stainless steel. The Mini 8 are short and aggressive sounding. This set includes all necessary hardware to mount the muffler onto a stock header. If gaskets are required for installation, they are provided. No rejetting or remapping is required after fitment on a stock bike however we always recommend a dyno test. If the motorcycle has other modificaitons to the intake or exhaust system some tuning may be required. Delkevic mufflers are handcrafted from the finest quality materials to enhance your motorcycle in both performance and looks.