agree with the posts above, either supercharge the one you have, or, if you're worried about warranty issues, trade your 3.0 in for a 4.4 or better yet, a 4.8. When you price out swaping an engine verses a supercharger, you'll probably spend more than you would buying a used 4.4. good luck with whatever you chose, I too am looking into ways to beef up my 3.0, but I think in the end I'd rather have a 4.4.