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You ever tried the NOS octane energy booster? Comes in a blue bottle with an orange top. You can get it at the gas station. Pretty cheap, too. I have heard of guys putting it in their motorcycles as well and getting instant results. Just make sure you get three bottles of it when you get it. If the engine starts running slow or hesitating, that's normal. The special ingredients are cleaning the cylinder bores out. Then let it sit for a few hours, and bam! instant horsepower gains!