I made my order for my cold air kit. I went with the Mac. I know it might not be the best, but it was the most afordable and it will do fine. I also ordered on of the vararam stacks for the tb. That should help.
So now the Exhaust is done, cold air/tb will be done, then LS1 edit in a couple weeks. and im done for a little while, I got way to much to pay for now.
what should come in the spring? Headers?

 

what will it take ontop of the above mods to put my 03 2500 HD 6.0 4x4 ec into the low 15's?
headers high flow cats, what ealse?
It has 4:10's already.

 

i shot of the ole juice might help ya!