Well, remember you are dealing with a V6 motor so NA is limited when compared to a V8, you are not going to get 450whp. I will say 400whp is probably doable in the 370z, but you are going to put up big money to achieve this. Now if you want modest goals, then intake/LTH/exhaust/pulleys/tune will probably give you what you want.
Throw in some balancing, coilovers/sways/weight adjustments and you will have a solid car.
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