4G63, although it's supposedly about to reach the end of its life in the Evo. Evo X is supposed to be using a substantially different, all-aluminum powerplant. Have to see how that turns out.

LSx. They mix and match parts among all of them, might as well not specify just one. Since we're talking about tuner engines, the LS2, since it's the only one that comes in something reasonably affordable and sporty.

The 6.1 Hemis are supposed to be pretty good, not that I've researched them enough to know any details. They just need to put one in a real 2dr performance car, which I believe they are currently planning to do.

What kind of potential does the new 3v 4.6 have? The old single cam mod motors pretty much sucked, and hell, the dual cammers weren't that spectacular either, with the exception being the awesome blown 03/04 Cobra engine.