Do you want the absolute highest quality mini-bike exhaust system on the market? The next generation in D-Section exhaust system, the D2. This design incorporated air-craft quality stainless steel header and mid-pipes that have been tuned specifically for each model to optimize performance and power gains. A lightweight “D profile muffler is used to dramatically reduce weight on all models. BBR s unique “D muffler also allows for maximum tire clearance and packing volume. For all applications, the BBR D2, come as a complete system including header and muffler. A USDA Forest Service approved spark arrester is also included. If you need to reduce the db lever, BBR offers an optional Quiet Insert that will keep the neighbors happy.