Yoshimura RS-4 Replacement End Cap KitYoshimura RS 4 Replacement End Cap Kit Fits all RS 4 mufflers with a standard 15 degree turn down tip (Not compatible with RS 4S or RS 4T models). Made in our composites shop in Chino, California with heat resistant pre impregnated, high gloss lightweight carbon fiber. This replacement carbon fiber end cap kit has all the parts you need to do an end cap swap. NOTE: Please contact our sales department if you are not sure about your end cap