Just wanted to give my two cents so far... I have about 500 miles on the kit. I am very pleased with it thus far. Vibration idle is more like the POO 600's now. Turned the oil pump up 2.5 turns... Ran against a buddy with stock 800 and I was able jump him by 2-3 sled lengths and kept pulling... Seems to rev up much faster. Hitting 8300 rpm and then she settles in at 8150 +/-. To me it was money well spent!!!!