Any Free Mods for the 8.1 liter?

[Pewter99]

Are there any freemods that can be done to the 8.1 liter like you cna do to the other LS1's? I have a 2004 2500 HD with the 8.1/allison.

[Chev8.1]

Port the tb, Gut your airbox also cut the front out of the airbox, to take in high speed air coming around the headlight. And for a couple bucks, do a home made intake tube(this ones makes the difference). That about it I think. Just work on air flow, this is seriously stuff-up.