In NISMO's, its about 332whp to get 400bhp. Considering most NISMO's are in the 290whp range then a total of about 40whp is needed. So intake, hfc's, catback, tune. All of that should put you over if you do it right. "Right" meaning don't get cheap mods that net +5whp as opposed to a mod more like Stillen which are upwards of more than +15whp each. Just using Stillen as an example, there are other ways.
So get +40whp is the answer.
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