there are alot of ways to do what you want. the best way and proper way is to get a msd retard box. this will retard the timing when you hit the juice only. next, what hp level do you actually want? you dont always need to lower your timing for the nitrous. running 13 timing with up to a 150 shot is fine. as long as the fuel system is correct. from the factory the jet recomendation are high on the fuel ratio to prevent running lean and hurting the motor. so by going up more on the fuel will hurt nitrous performance. i would just set timing at 12 or 13 and leave it. changing you timing back and forth for street or strip doesnt really give any performance gains. it only moves the power band around and is used for tuning.
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