Honda CBR250R 18" Carbon Fiber Oval Muffler Exhaust Slip On 11 12 13 14 CBR250R (2011-2014) Delkevic 18" carbon fiber oval mufflers are made from a preformed composite carbon fiber sleeve and high grade 304 stainless steel polished to a mirror finish. They have a deeper sound even at high revs. 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.