shumacher vs tti 2 inch

well im gonna put a 440 in my duster and id like to keep power steering and overall i feel like ill be happier with the schumacher tri-ys. and i will probably buy them either way. my real question is what would be the horsepower difference in say a 500 horse motor with the tri-ys instead of the tti 2 inchers? i know you will lose some power but i wondered if anyone had done any testing and found a concrete number. also does anyone think the difference would be really noticeable behind the wheel? thanks