The whole reason you add another exchanger with the stock paxton setup is to have that extra capacity. Why do think most cars over 1000 hp all use water to air intercoolers. Water displaces heat much more efficiently as long as it is setup correctly for it.
As for the stock paxton, it's not really that efficient, I would make a couple pulls and the car was dog even with the so-called best intercooler with it... With another heat exchanger in the back, it would have helped out a lot.. but the actual intercooler itself is not efficient, it the stock one was alot bigger then you wouldn't have as much of an issue and really gain performance with the extra heat exchanger.
My twin turbo setup is almost finished and uses a water to air setup for this reason, we are estimating 1100 1300 rwhp. So I will let you know what the actual facts are when the car is run.
