I put a orange performance cdi on our 2004 baja dune 150. With the stock cdi I have run our dune 150 down a wash and at top speed I could hear a ratling/popping noise. I would say the valves were floating? With the orange cdi no rev and advance same top speed . The idle had to be turned down a quarter turn with the orange cdi. The take off performance was better but climbing with my son was not as good with the stock cdi. I weigh 200lbs and my son weighs 175lbs. Our engine is stock 150 gy6 valves set to .003
intake and .005 exhaust jetting 115 main 34 pilot. I guess that if you modify your engine you arer best to go all the way. Best money spent so far is 10 gram sliders and 1500 torqe spring as far as low cst upgrades. I do recomend 91 unleaded for advance cdi.
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