Jackpot RTX 4.5" mufflers were developed for excellent performance, big sound, & great looks. The RTX cores were developed specifically to provide a big, deep, & powerful V-Twin tone riders are looking for along with dyno proven performance. Jackpot RTX mufflers have slightly more volume and deeper tone than our Hi Roller & Outlaw mufflers with the same great performance & excellent tuning characteristics. End caps are machined from solid T6061 billet. Includes easily removable stainless steel inserts which allow users the ability to tune the mufflers to their specific engine configuration or the sound level they are looking for.