i know its been discussed but here goes.

I have an 03 2500 HD 6.0, 4x4 ex cab short bed. i have a cold air kit and duals.
im looking for a header to bolt right up to the stock cat pipes.
who makes the best overall power wise, install easy quality ect.
once the headers go in i will be tunning it with HP tuners.
also with a good tune and headers i should be able to expect 10-15 rwhp correct?
thanks guys

 

To keep the stock cats, you are gonna have to use a shorty header, which most people here dont recomend.

 

they dont make power? i know my first set on my car where mids and i made 22 rwhp with no tuning.
how hard are long tubes to put on? and what kind of power gains?

 

They say shorties are good for like 5hp, but if you go with longtubes, they are good for like 15-25 hp. You can try the ASM, thorley, or supermaxx systems for a 4x4 truck. Should not be that hard to install. Just a little harder cause most haave to go in from under the truck.

 

Most people that are running shorties are using Edelbrock and are seeing about 6-10 rwhp gains. They are an inexpensive header, less than $300 for ceramic coated, if I remember correctly.

JBA offers a higher quality header (Cat4ward) and is promising a little more of a gain, but their price is over 2x the Edelbrock price. It is hard to get hard info out of JBA, but I think the gains would be in the range of 10-15 rwhp. There are a couple of guys at silveradoss.com that are running these headers and may be of more help.

 

whats the best long tube then? for 5 hp its not even worth the swap.
i have a lift, and work on my camaro on my own, so im guessing headers on the truck will be easy in comparison to the car.

 

I hear alot of good about asm or thorley, but the supermaxx is t304 stainless, and comes with new hi flow cats.

 

supposedly ASM's are the cream of the crop. Thats what I have on my 6.0. But some say there are others out there equally as impressive such as pacesetter etc.

 

did you get exact gains when you installed them?

 

what about Kooks? if they even make them for the trucks?
i know they make one of the best headers out.