Sorry Andrew, I'm not sure if that was a serious question. (It gets asked and answered pretty often, so you could be just pulling our collective legs.) forgive me if I missed the joke.
The Magnuson-Moss Act prohibits a dealer from denying a warranty claim on the basis of aftermarket equipment unless the dealer (or company) can prove that the aftermarket equipment caused or contributed to the failure. Here's a decent resource:
http://www.zabteck.com/MagnusonMossWarrantyAct.pdf, but I would also recommend doing a web search to find out all you can about your rights and responsibilities.
Obviously you can't expect your dealer to warranty aftermarket parts, so you're depending on AEV's warranty for their suspension (if that's the way you end up going) and after it expires, you're on your own. But if you have a head failure and your dealer refuses the warranty claim because you have lifted your Jeep, then you have a legal claim against them under Magnuson-Moss if you want to pursue it. Under that hypothetical, I certainly would!
We should probably move this discussion to another thread or PM. Kind of a hijack of the "Post your pictures" thread. Apologies to all/any who were annoyed by the discussion.