Exhaust Pipe SIZE?

[c10srule]

2 1/4 is good to 400 hp, 2 1/2 is good to 500 hp, then you need to go 3", i put 2 1/2 pipes with stainless glass packs on my wifes with a 375 hp vortech head 350 and she won the rackoff contest, we did the same setup on our boys with 2 1/4s and it was pretty loud and sounded pretty good as well, now ive got 3" on mine with summit mufflers 30 degree bend with 4 1/2 stainless tips in front of my rear tires but it has a 580 hp 477 and im telling you its really loud, but it sure sounds good,