Unless you are going with forced induction, a meth kit won't buy you much on a stock motor. You'll see a small gain since it does essentially raise the octane level by cooling the fuel when it burns but it comes into play a lot more when you're raising boost in a turbo engine/supercharged where the car will begin to lean out. On a stock car...personally I wouldn't bother.
Good luck!
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Chris 
Current: 2014 WRX Stage I + SPT / 2013 Hayabusa 202HP
Former:09 370Z 7-AT PW/Ark Type 2 exhaust/Evo R lip/TSW Nurburgring carbon
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