In this video, I test my new 2023 YZ450F with both the stock exhaust and a full Yoshimura system on my local pit bike track.

Which is better: Stock, aftermarket, or no muffler at all? We took our R1 test bike to the Dyno room to find out.Animated GIF by Kathleen Conner Wrist: Zack Courts MSRP (2015): $16,490 Miles: 3,082 ...