^^What he said^^
You can get the Smarty JR which is up to 100 hp for $495
Or the Smarty SO6 or REVO POD, which are up to 170 hp for $685-715
If its a manual the clutch probably won't take more then 70-100 hp. If its an auto, 70 hp is probably safe. Valvebody and converter will let you step it up.
I've run both the JR and SR on my 03 and I'm very happy with them.