i run 2 Rule 3700 submersibles also, we talked to Bell IC and got a custom core made by them to what my hp goal is, then jason at wcfab put some end-tanks on it. i run about 100lb of ice per pass. data logger is very handy to have to make sure your intake temps are in check. we ran a home-made data logger last year for the first time and even after logging it on the engine dyno it is surprising to see the difference between a dyno pass and an actual pass down the track.