Quote Originally Posted by Malefic_GP View Post
What are you? A noob?

My SLP header gave me 25 hp, SLP exhuast = 15 hp, and K&N intake = 17 hp. A total of 57 hp added on.

For the 99 looking at the mods I see that the K&N intake gives him 13hp, SLP headers =25hp, and SLP exhaust = 15hp. A total of 53hp.

The headers gives him the 20 hp you said and 5 hp more. Just go on 3800performance and look up the parts and hp.
On each of those product's page, it says "up to XX amount of HP". That assuming the absolute best conditions for that one mod alone. They will give you less than that, and as they add together their cumulative effect becomes less.

But, make way for you, the more experienced one... Apparently I'm just a noob...