Agree with 2500hdon37s. The stage 1 jet kits I've seen and installed come with (3) different sized jets for use depending on if it's a stock exhaust, an open exhaust with baffles, and an open exhaust without baffles. You can use a stock air filter replacement like K&N with a stage 1 kit as well. Then there's stage 2 kits for the above but with modified air boxes, stage 3 for individual filters, and stage 7 for racing applications.
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