Honda CBR250R DL10 14&rdquo; Carbon Fiber Round Muffler Exhaust Slip On 11 12 13 14 CBR250R (2011-2014) Delkevic DL10 14" carbon fiber round mufflers are manufactured from a pre-formed composite carbon fiber sleeve. The end caps, rivets and bands are manufactured from 304 stainless steel. This muffler gives a decent amount of sound over stock but can be fairly quiet with in low RPM. This is a great pipe if you want some sound but not to be too loud. 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.