With two choices on a silencer tip for my stock yz exhaust, I looked at this extra insert for my wr and made it fit with a little grinding and pounding. The result is good! After hearing mixed reviews on the db dawg and the pmb insert for the yz exhaust costing over 100 bucks this was a good alternative. It seems to run fine and I probably won't have to rejet. It is a dramatic decrease in sound. I can't figure out how to post a pic but its self explanatory. The wr insert is just a little bigger diameter and also too long. I did some grinding all the way around and also cut the length of the wr insert tip in half. I hope this helps someone looking for a low cost sound solution.