The Hellion kit starts at about $11,000 I think. I added a couple of things...(got extra heat wrap for sure). I got a Cat delete kit also. Add the tuner and the Roush catback and it's probably around $13,000 for all the hardware. It's a lot...but it's ridiculous. Horsepower is expensive.
13K ain't shit in the grand scheme though. You'd easily be 20K to 30K in the hole if you traded it in on a new Raptor. A new Raptor won't keep up with that, even with mods.
The Jen2 guys (mainly the guy whose user name starts with w, and ends with hatexit) have their "6.2L potential" meme they like to use, but trucks like this prove the point. A bigger engine DOES have the potential to make power than a smaller engine. You are 100 HP over what Ford makes in the GT with it's even-higher-output TT V6.
It's too bad we can't get an all out effort from Ford on a V8 since the last GT500 was built. Fiat will eventually force their hand with all these S/C 6.2L engines they are sticking in everything. That new Grand Cherokee would be a ******* awesome daily driver. Still not quite awesome enough to overlook how crappy Fiat products are, but, almost.
Do you still have a stock bottom end?
What was done to the fuel system? Pumps, lines, injectors, boost-a-pump?
As for the cooling, yea those vents are quite a bit smaller at the bottom than the top. Good idea to open them up. If the engine itself is getting hot, you might want to look into a stand alone oil cooler. You can pull a massive amount of heat out of the engine and cooling system by cooling the oil separately. If it's the turbos radiating the heat, they make some nice heat shield/turbo wrap blankets that would probably take care of any issues with that.