How to get 18 hp?

Well im REALLY wanting to hit 500 horse but dont want to spend too much to do it...

I know i could probably just through on a smaller S/C pulley but i think im pushing it with the 9.7:1 compression now, on pump gas anyway.

I have the 80mm pro-m MAF and 70mm tb. Along with ported heads.. I have LT headers and offroad h-pipe and flowmaster cats-back..

Im thinking of upgrading my headers and going to 3" exhaust... But thats quite a bit of money and i don't know if that will make the extra 18 or not?

Another thing is my cam was setup for a NA setup, I have asked Ed about this and he really didn't say much just that if i upped the boost any more i should consider a swap. With his trade in policy its only 150 to get another one. Im sorta thinking about this cause i think if i peaked a couple hundred rpms more i would have no problems.. Im peaking around 5200 now.

I would also assume there is a little left in the tuning, but i have heard rumors that the place i take my car too is going bankrupt and the closest place besides them is like 300+miles away.

Any ideas?

here is a list of parts:

Vortech s-trim
AFM Power Pipe
Systemax intake
ported trick flow track heat heads
FTI Cam
80mm MAF
70mm TB
mac lt's
mac o/r h-pipe (how much would an x pipe improve anything?)
custom superchip
msd box

Forgot to put in my list... AFM Power pipe.

Grn92LX said:

Did you actually degree the cam in or just throw it in at 0*? If not, degree it in exact and set it to the retarded centerline. That should help up stairs power.

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the cam was degreed in to the specs and not with the intake centerline methode. It is a NA cam though.. Might be a good idea to retard the cam a few degrees, to push the powerband up in rpms, and see what happens though.