I want to gain some horsepower wood some headers heip me out?

(2010-05-29 09:53:17) 1. Randy Says: i have a 09 gmc sierra z71 5.3l v8 it come with 315 stock im runing it with a cortex superchip street porformence throttle body spacer k&n cold air intake system and a one in one out borla exhaust it runs a lot better but im wanting some more horsepower how much horsepower does any one think did i gain with all this on my truck to the back tires just with the bolt on's ???????? and if i was to add some headers how much horsepower wood that give me also what i wanted to no
with all i have on my truck wood i keep up with a 08 toyota 5.7l v8 ext cab with just a k&n intake and exhaust on it ????????2. Old Man Dirt Says: The exact gain in horse power with tuned headers depends on the RPM range, header design and construction. Some will help with the low end, others mid range, while others are for high end.
I would suggest talking to some one in the business that truly knows performance, or searching a site that deals with the subject like this one: http://www.summitracing.com/expertadvice/
My personal choice for headers are tri-wyes, but what I want for power and where may not be where you want it. Tag: I want to gain some horsepower wood some headers heip me out?