The E-Series universal 2/1 muffler allows user to tailor the sound and performance of their current 2/1 system. This is a direct replacment muffler for many popular systems inluding the D&D Fatcat & Boarzilla, V&H Pro Pipe, and many others. The E-Series elliptical tuning system allows you to add or remove discs based on the performance requirements of what your motor requires and has been tested to over 175Hp. The E-Series muffler also gives you the ability to adjust to a specific sound level you are looking for. The kit includes E-Series muffler with FLH style mounts (23.5" w/ 2.5" inlet), pre-installed tuning discs, and stainless clamp. Optional components include E-Series rear heat shield, and stainless adjustable extension (allows muffler to be used in applications up to 28")