Arrow Pro-Race Slip-On Exhaust Kawasaki Ninja 400 At the turn of the 21st century, MotoGP saw a revolution in exhaust design that strayed away from old school round canister shapes and instead incorporated the muffler into the mid-pipe itself. This design not only reduces mass but also overall weight. Now this same design is available to you in the form of the Arrow Pro-Race Exhaust. From its cone-shaped sleeve, angled round end cap, integrated exhaust hanger and TIG welding all around, this exhaust screams performance without compromise. Because of the internal volume and shape of the Arrow Pro-Race, Arrow was not able to produce it for every single motorcycle. Arrow found through research that most bikes exceeded acceptable noise levels when fitted with the Pro-Race Exhaust. If your motorcycle is among the chosen few, consider yourself lucky. Features: Increased horsepower and torque Significant weight savings over stock muffler Nichrom stainless steel construction Integrated TIG welded exhaust hanger Note: Muffler images are for reference only, actual muffler will vary slightly depending on your bike's make and model.