this question is really broad. nitrous is reasonably cheap for instant,but ,short lived power. it only woks as long as you push the button. you can buy bolt on power such as bigger exhaust,cold air intake,bigger coil packs,stronger plugs and wires.with these you have the power all the time,just not as much at one time.and nitrous will cost you more in the long run because it will cause damage.
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