Kawasaki Ninja 250R EX250 Mini 8" Stainless Steel Round Muffler Exhaust 11 12 13 2011-2013 Delkevic Mini 8" round stainless steel mufflers are made from high grade 304 stainless steel and polished to a mirror finish. This short muffler has a large slash cut outlet and is aggressive sounding with or without the baffle installed. 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.