Get a Saleen S/C kit (run it on high boost)
Have someone who knows the motor port the heads, get cams/springs.
You might want to go with lower CR forged pistons, and eagle H-Beam con. rods. Fine balance the rotating assembly
Covert the
tranny to 6 speed (Dodge Viper T56
tranny)
Redo the whole suspension with coil over Bilsteins or other made in Germany brand (they work with Porsche, and know their $hit)
Reenforce all the weak spots on the platform (I don't know where they are on the '05+ platform)
Get nice wheels and meats.
Put a big a$$ Brembo (and only Brembo) brake kit in the car
When you're done with the mods, see Chip Foose and get a custom interior and a paint job you like.