3.5" downpipe (if not get a 3"

this is good for some SERIOUS hp.
I would consider changing the blitz BOV. They don't seem to work very well. HKS makes very nice units or if you've got more $$$, Greddy is an option as well.
Does your car have a boost controller? Manual or electronic? If not, you might want to consider an HKS EVC IV with the scramble boost built in.
Cams are always an option. It all depends on where you want to go and of course, how much $$$ you have.
The sky's the limit with this car!