Getting ready to pull the trigger on which ever one I get the best deal on (looks like the same bike) and just want to get all the quarks on the bike done up front. Seems the starting/power issue's are cleared up with the purchase of the comp CPU and Programmer but a little uncertain on the pipe. Has anyone just tried using the performance insert for the stock pipe and is there much of a difference? I've owned 2 YZ450's one with White Brothers the other Dr. D's and performance wasn't huge over stock so; honestly don't want to put the money on a pipe unless I had to. My biggest concern is just getting the electric starting dialed in vs power output. Also this being my 1st fuel injection bike, how often does the fuel filter need to changed out?