(searched for "hp gains pulley" and had about 20+ good results, this one being quite useful as a starting point)
https://www.crossfireforum.org/forum...eedswings.html
also
Performance auto parts & aftermarket auto accessories for your car, specializing SRT4, Crossfire SRT6, SLK32, C32 AMG, VR-4
and
Eurocharged Performance and Tuning- Exotic and European Tuning Specialists

the last two are both aftermarket performance companies. Which one you work with is up to the free market, personally I rep NeedsWings, many go EuroCharged, both have good gains, although in terms of intake NW is the most popular. Read that thread I put up, as well as do the same search I did, and you'll find TONS of info. Welcome to the forum if you haven't been welcomed already, I promise we're not snobs, just a group of like-minded individuals .

PS - just a list of numbers pulled from Rob (NeedsWings)'s website:

NW dual CAI - on sale for $800 - up to 35 whp
ASP 178 Pulley - with the pulley saver kit, $1000 - advertised 20 whp, but that's probably a low-ball I'd say a good 30whp without a tune is possible
Engine tune - tons of places, tons of prices - anywhere up to 50 or more hp
NW modified intake manifolds - 1500 - well worth it IMO, better gaskets, and with a tune up to 40+ whp gained.

If you're going all out and want to road race, dont forget cooling modifications as well!