Okay guys....don't let me down now. You all gave me great advice in my other threads, so I need your input again.

I want some headers. Any suggestions on the best brand to purchase, to install on a 2003 GMC 5.3 4X4? I am intrested in the best power gains, best fitment with no leaks, ease of install without having to modify several other pieces of my pipe, best sound and the best looks and quality. And what brand offers the best warranty on their product? Thanx guys, hope to hear from you all with some great suggestions.

 

ASM or TOG i know more than one person that uses and will always swear by ASM yeah i know i have edelbrocks but you asked for the best and damn it if i dont have em i say ASM

 

The ease of install award would have to go to Dynatech Supermaxx. It replaces everything from the muffler foward (including cats), requires no welding, and will give you some solid torque gains. I picked this because I can return to stock at any time, no torch required!

The only down side is that it is VERY expensive.

 

I have to second the Dynatech Supermaxx system. I have no complaints with mine. True bolt on. No leaks. Fit great and I dropped a 1/2 second in the quarter with them.

 

I love my ASM headers, three years old still look new, very good performance gain. The Thorley's slow put on his truck are good also.

 

how do you like those headers? i thought about getting some even though they run around $1200

 

I've got thorley lt's bit(h to get in but sound great with 2chamber and turndowns. With those and high flow cats seem like I shaved like .2 off 1/8, but that was 2yrs ago and they still look brand new.

 

I would have to say TOG's. I love them and i got a huge differance with them. They are a little expensive, but worth every penny.

 

As long as you stay away from shorties.

 

. Shortys are nothing but tubular exaust manifolds.