-lightweight 15" rims
-lightweight flywheel, but not too light for the launch
(at least you don't have to worry about landing in lift)
-drag radials (and use them right for a better launch)
-PowerFC and datalogit and dynotuning with wideband o2 sensor
don't know how much cams for the GT will add. not sure if someone has dynotuned this mod yet. perhaps monkeywrenchracing has or will in the near future.
higher compression pistons, MWR big bore pistons and sleeves kit (1.93 L), valve springs to rev higher (if you can make power there).
stay away from crank pulleys, you'll run a high risk of blowing your engine.
you can get the AEM
or UR alternator pulley and the UR water pump pulley but that might just give you 1-2 hp. maybe for another 1 hp you can get a shorter belt to bypass A/C.