Actually Rob, I have already discussed this with my dealer, and with a warrenty, a pipe has or should NOT have anything to do with your warrenty, only if motor work is done .. I bought an extended warrenty and asked him if this will void it, and he said absolutely not , or Im not worried about that..Isnt mosst CT pipes not spark arrested??? I hear alot of people like there pipes,but they wont have there pipe out for a bit still, as for Yoshi, I am real curious, Im mostly wanting to wake up the first gears mostly, and I like an even power from top to bottom thats what I liked about my Yoshi on my 400ex, I still want to see some numbers, but I still am leaning towards Yoshi since I know firsthand how it is.. You know, I have heard alot of bad comments about Trinity service and a frinde of mine had some motor work done and they screwed up the head and he ended up buying a new one..hmmmm,may rule them out if they are that unrealiably of good service ...So tell me, is this true that WB is discontiuing there pipe altogether???I dont care for WB pipes but thats just me,if I had to chose WB or stock, I would stay stock...