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i put one on because i put my nitrous nozzle in it but other than that there is no and i mean no reason to buy one unless you like buying shiney pieces of metal
They are only good for carb engines, and even at that, still not worth much. They "spin" the air to atomize the fuel better, and with a carb, the air spins and fuel meet at the same place = GOOD. Our fuel injectors are way down the runners, any spining velocity is lost by then, WORTHLESS! Im sorry I cant say that enough.