Honda NT650 Hawk 9&rdquo; Stainless Steel Oval Muffler Exhaust Slip On 88 89 90 91 NT650 (1988-1991) Delkevic SS70 9" stainless steel oval mufflers are manufactured from high-grade 304 stainless steel and polished to a mirror finish. This pipe is loud and aggressive even with the baffle in. This muffler is great for short trips around town where you need to be heard. 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.