Looking at getting a new DI 3.6L from GM? Might wanna wait! Chrysler's new Phoenix (Pentastar) 3.6L is 40lbs lighter, and has a monster torque curve. 90% of peak torque power comes on from 1600rpm to 6400rpm! Only makes 280hp and 260ft.lbs right now, but will get DI fairly soon after it is out. Just something to watch out for by the time you actually get a new engine. Heck, could always get this unit, and then slap on a supercharger or turbocharger and barely weigh more then the GM 3.6L.