You can probably get 15 hp with a tune. But if you are doing it only for power I would jut save that money and get a supercharger later on or something. Probably cost you the same amount for a bolt on kit as it would for header, exhaust, test pipe and intake. Or close to at least.

 

Butt dyno can't tell if you gain/lost 15hp.

 

Butt dyno can't tell if you gain/lost 15hp.
[/quote]

lol true that,,,, that is especially true in the s2000