I drilled out my stock exhaust tip but instead of going the full two inches, I just drilled out the inner pipe. My drilled tip outlet now measures 1 3/8". It was a little complicated to accomplish but I already have a Pro Circuit T4 which is too loud for dual sport riding and I didnt want the stock tip too loud also. Have any of you done this and have some jetting specs? We are still at sub freezing temps here for a few more days. I plan to try it this weekend as it is supposed to get up to about 50 degrees F.