Yoshimura RS-4 Stainless Slip-on Muffler 2014-18 Yamaha YZ/WR250F/X | 231012D320 F800GS Self-cleaning mud grooves to prevent

Self-cleaning mud grooves to prevent dirt build up

For machines originally equipped with non-O-ring chains

CRF450R ('09-'12)

Large mesh vents for maximum airflow

Chiseled shoulder block shape penetrates the surface to enhance side grip

Yoshimura RS-4 Stainless Slip-on Muffler 2014-18 Yamaha YZ/WR250F/X | 231012D320 F800GS Self-cleaning mud grooves to preventFitment: Yamaha WR250F 2015 2018 Yamaha YZ250F 2014 2018 Yamaha YZ250FX 2015 The work that went into developing the RS 4 muffler has paid big dividends in Off road Racing; winning multiple Supercross and Motocross titles since it's inception. We've developed the current generation RS 4 based on that research & development, and the result is a unique design that provides an unrivaled combination of power and quiet exhaust tone. The RS 4 features a