2012 KTM 250SX F Yoshimura RS-4 Full Titanium System
Yoshimura RS-4 Full System Exhaust The work that went into developing the RS-4 muffler design paid big dividends in 2010 with Ryan Dungey winning the AMA 450 Supercross and Motocross Championship series as a rookie in the same year, and again in 2012 with the Yoshimura-backed GEICO Honda team winning both 250 Supercross Lites titles. That same R&D has been directed to developing the current generation RS-4 a unique design that provides an unrivaled combination of...