Does anyone have one of these, or know someone that does?? They look really good, but I was wandering how they compared to other/more popular pipes. I figure someone on here has one or knows someone that does. Thanks....

 

I just installed one on my wife's 400ex and it performs very good. She had a Big Gun and a Stroker and the R4's finish is much nicer. Powerwise the R4 seem's to rev a bit higher than the other two with about the same low to midrange power.