Austin,
couple things...
1) Congrats on the new ride (she's a beaut)
2) Coming from a fellow Subaru guy (I own an 07 Legacy LTD), you CANNOT do a turbo setup on the existing 2.5i... (AVO still hasn't made the turbo kit, but it wouldnt matter because our engines are too high compression-boost would be limited to 5psi max...thats ridiculous, sorry)
only thing you can do is swap in a WRX or STi motor.....but then you'd be breaking ur tranny which would cause you to do the 6spd STi swap as well...and then forget about upgrading internals unless you cryotreat that tranny...
its not an easy upgrade as I considered this when I first got my subie because the dealer didnt have an LGT with automatic with black leather
any questions, please ask..i've become a subaru guru
