what horespower does a big bore give

[6858-400ex]

what horespower does a 440 kit give my 400ex

[frogburner]

Depending on all your mods, I would say anywhere from 35-40 horsepower.. I'm not for sure, but I would say thats pretty close. Mine runs pretty good, but to really get the full effect of it I have to use my buddies WB rev box..