Cruise is easy to keep. A/C may be a little tougher but not impossible.
Most people have had best success with a 27" core intercooler with in/out on opposite sides.
I would highly recommend staying away from OEM intercoolers, unless its from a Mitsubishi Starion/Conquest. They're great but have small piping. (can be customized though)
If I remember right, my intercooler measures (core) 27.5x11x3 its a pretty common size, it will fit well behind the bumper. Taller = better.
People have run 2.5" piping from universal kits. 2.25 wouldn't be bad.
Here's how mine was setup:
You'll also want a 1.5" (is it 1.5 or 1.75?)to 2.5" 90* reducer/elbow to connect the stock turbo to the piping. You can get them from Siliconeintakes
YMMV, just my $.02