Well you honestly could keep the 3.25". You got your headers, T-Stat, plugs/wires...now...go buy a full sized Intercooler...all you have to do is pull off the blower, set the IC and run the coolant hoses...and take off the bumper and install the H.E. You said you didn't want to do anything internal and pullin' off the blower to do a IC is a great mod. Or if you have the tuning ability I would run a large nozzled Methanol setup.
Seems like money isn't your issue lol, so I would say this...ZZ Performance A stage 2 IC is fine, but if you have the money might as well get a S3...it still has heat soak like the S2, but A LOT less. But honestly it is up to you. Then you could send your blower off to Green Bastard Products and have him port the GenV you have to lower temps to boot and more HP. And who knows...then maybe upgrade to some Roller Rockers and you'd have a 12 sec. car
After all is said and done you will need a custom tune so I would try and find someone near you in the WI area that can tune your car.
Hope this helps ya.
