If you would like to make some decent safe power in a 4 cylinder get the GM Performance book on the Ecotec.
This engine can easily make up to 500 reliable HP that can be street driven. Note GM has had several show Solstice with this and the pro drift champion that Rys Millin drove an entire season with no break downs or rebuilds.
I drive a Ecotec daily with 23 PSI of boost and 300 HP with 315 FT LBS. the torque is limited due to the FWD transaxle. If not for that it could easily do 340 FT LN as in the Solstice.
I only have a GM turbo upgrade with 2 3 bar maps and a flash. You can get up to 400 HP and only make a few changes to reach 500 HP like rods and pistons with a more aggressive cam and bigger turbo.
Here is just one example and there are more on the web. http://www.solsticeforum.co...uild-complete-69273/
Start here and the second book is the best. http://www.summitracing.com...eyword=ecotec%20book