[Stratocaster5292]

I have a 2000 Saleen S281 that isnt the supercharged model, it has 285-290 hp depending on who you ask. It already has a performance air filter, exhaust, a saleen s belt, and has the saleen powerflash. I was wondering if there was any way i could get it to somewhere in the 330-350 hp range without any power adders like a blower or nitrous. Ive looked on Steeda and Marcymotorsport website and they have only limited info on the subject.
Can anyone point me in the right direction of some package thats offered, like heads or a new intake system that I could get that power and still come out a little under the price of a supercharger?