I'd be a little more boring. Either the Turbo I4 or the V6 from the Hyundai Tiburon (with 6-speed gearbox) into my '05 Elantra.
Alternatively... If I had a crapload of money to throw around, Mitsubishi 4G63 Turbo from the Lancer Evolution into something like a Mitsubishi Galant, along with the Evo's gearbox and driveline.
Or, Chevy 350 into some small Chevy 4-door sedan. (Sorry, I don't know a lot of modern cars. I haven't been looking because I'm comfortable with the Elantra. I just wish it had more power at times.)