Right.
The stock cooler is not going to be able to cope with 14psi. The air is therefore going to be less dense and you will not be seeing the performance you should.
To compound this, is your pod filter in a enclosure or partitioned off from the engine bay? If not then again you will be sucking in enormously hot air from the engine bay.
All of this spells hot air in the engine, meaning crap all improvement over a stock car.