This mod replaces the stock XR600R or XR650L exhaust baffle with one from an ATC 250R, which has a larger opening. The exact baffle used was from a 1985 ATC 250R. It uses the exact same baffle as the XR but with a 32mm opening compared to 20mm. The larger 250R baffle is almost as quiet and with just a lower growl. The ATC 250R baffle cost me $5 at a salvage yard and took just a few minutes to swap out.

Credits: Todd submitted to Low-Buck Mod Contest, edited by 4Strokes.com.