Engine mod questions

[nj3talpha]

I stumbled upon this today http://seriouswheels.com/cars/2008/top-2008-Hummer-H3T-Weekend-Warrior.htm

here is the brief info "Starting with a new H3T Alpha, engineers added nearly 70 horsepower to its 5.3L V-8 via components available through GM Performance Parts. They include LS2 cylinder heads (part number 12576063), a higher-lift camshaft (part number 12574519) and supporting components. Also enhancing performance is a custom, 3.5-inch exhaust system."

I've been trying to find these parts and the supporting components to go along with it. Any help would be appreciated.

 

[f5moab]

If they are still available, contact your dealer.
Just remember, GM parts numbers can change, so an up to date dealer parts catalog is the best way to find any GM parts.