The streamlined design reduces weight and improves flow through the exhaust, offering a deeper exhaust note. Stock muffler, or any aftermarket slip-on, will fit this pre-muffler replacement. Factory bushes and frame mounting points ensure compatibility in robust, long lasting design. The hand welded, brushed finished system is a simple upgrade for anyone wanting to bring their Hypermotard 1100 to life! Once combined with the Slip-On Line exhaust, this optional header offers a significant improvement in performance across the entire rev range.Made from perfectly formed 304 Stainless Steel the addition of this header increases throttle response and power control, and improves the sound to make the most of the Hypermotard 1100's engine character on any ride. Easy to install, No Installation Instruction We will give you a sticker as a gift after you submit your order.