It's really up to you. The way I'd do it (If you're really hell bent on getting the 2.3) is to sell your current 07, and find either an ST or a SVT then build up the internals and turbo it from there. Depending on how much boost you're gonna run, forged rods and pistons are probably a good idea, but I think that's for applications over 8lbs. It still couldn't hurt though. The best way to turbo is probably just to get FSwerks' turbo kit. All inclusive for under 5k. Not a bad deal, and well documented.