running a hot juice and predator but it doesnt seem to be a very good stack. i want to stack something with the juice to make close to 500 hp. im thinking about the quad 215 any other suggestions I had it dynoed with the juice on 5x5 and the predator on 65 hp and it was 438hp and 835tq but when i turn the predator up any more the truck seems to me like its losing power and not making any big gains

could need a lift pump