well, above 12 PSI you NEED an intercooler.
If not you are actually stealing more power than your trying to make.
Unfortunatly, when you put an intercooler on, you need a bigger bypass valve (assuming it flows decently) or else you will get compressor surge so bad the car will not drive. The stock one can not flow enough air. Hell, 3 stock ones cant, i tried it. I have the mini race valve and love it. Worth every bit of the $175.
The paxton unit is ok, small, but ok. You still need that valve.
Go get it.
...it's shiney!!!!