Details

When you’re looking at putting the Yoshimura RS-4 Stainless Aluminum Full Exhaust System on your dirt bike, you’re looking at Yosh’s premium dirt bike exhaust designed for the racer that wants to squeeze every last bit of power out of their machine. The RS-4 Full System starts right at your engine with a tapered header pipe that optimizes exhaust flow for both efficiency and power output.

Exhaust gas then works its way back into the pentagonal muffler where the polyresonant chamber tones the exhaust note down and pumps up power when you hit the mid and high ranges. Last but not least, the carbon fiber end cap rounds out the RS-4 with a touch of wicked looks and an AMA-approved sound insert that comes installed and ready to meet any race regs.

Specs:

• Race-ready stainless steel and aluminum exhaust system for your 4 stroke dirt bike
• Increases mid and high-end power
• AMA-approved sound insert comes installed
• Tapered header pipe optimizes exhaust flow
• Lightweight aluminum pentagonal canister body
• Polyresonant chamber lowers decibels
• Stepped, two-stage baffle
• Carbon fiber end cap
• Spark Arrester not included but is available (sold separately part #211887).