who can get more horsepower?

my friend has a 2003 chevrolet s10 and i have a 1995 chevrolet blazer and i have been told mine is basically an extreme without the ground effects, we both have a 4.3l vortec v6 but his vortec was removed and replaced with an aftermarket air intake kit. stockwise i have been told my engine has more horsepower and in the longrun would have more horsepower souped up than his is possibly able to. in othe words im asking can i get more horse power out of my engine than his?