I'll go ahead and beat Marc to the punch and say you can always do an Atlas 4 cylinder swap. The 2.4L Ecotec makes 182 HP in stock trim.
The 2.9l Atlas in stock form make 185hp and 190 lbft.
The manual bellhousing will accept asian (sp ?) transmission out of some of the jap sports cars.
They accept turbo charging well and being all aluminum - not to heavy.
As long as you retain the GM drive by wire throttle body you can fab any intake you want.
Limeswap can take care of the efi harness/reprogramming for you.