Summary: Presented by Rocky Mountain ATV/MC, Kris Keefer runs you through five mufflers in a shootout for both the 2018 Yamaha YZ450F and Honda CRF450
Summary: Presented by Rocky Mountain ATV/MC, Kris Keefer runs you through five mufflers in a shootout for both the 2018 Yamaha YZ450F and Honda CRF450