My WR came with this pipe, but no insert. Needless to say it was quite loud when I bought it. I purchased the insert and when I installed it, it not only quieted the bike, but I felt a considerable drop in the low-end "pop." The free mods helped a bit, but not entirely. Also, my bike will now stall, hot or cold, if I stab it right off idle. I'm not pulling hole shots, just trail riding, but I was considering taking the insert out and wrapping the spark arrestor with one thin layer of packing to dampen the sound a bit. Any suggestions/comments? I am pretty sure I can meet the 94dB mark with some packing. Will removing that insert bring back some get-up-and-go? Maybe I shouldn't have ridden the bike so much while that insert was on order, but you know how it is when you get a new bike!