Get Stillen, supposedly they got like 18 wheel hp gains. Nismo is about as futile as adding a "TRD" sticker to your Toyota.
Nismo plays it SAFE by yielding low hp gains because it works in conjunction w/ the factory warranty and Nissan is liable for any dealer installed Nismo parts.
The only hp-factory parts in my experience is Honda Type-R. Civic type R cams, header, etc. make real HP for Honda cars.
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