Is this cooler actually gonna cool 1200 horsepower without causing back pressure issues

 

I use their 2,000hp cooler on my 1,100hp car and it works incredibly well.
Back pressure issues, no.
Will it keep IAT's under control is the only question and that depends on hard your turbo is working.

 

Friend used that core on his build with a simple 5.3-76/75 turbo. Even at 30lbs it reported crazy low Charge temps. WIth ice water, he was still in the 65-70* range. Almost seemed too good for that tiny core. No pre/post boost to see what the pressure drop a cross the core was though.