Nexus/Crawford headers, Injen exhaust, Nexus test pipes, AEM/Injen CAI, JUN flywheel, Crawford cast plenum or AAM/Motordyne plenum spacer, ported/polished throttle body spacer (can't think of the brand, it isn't 350EVO), MaxGround grounding kit, B&M short shifter, lighter wheels, carbon fiber hood, cf fenders (only Carbon Creations makes front cf fenders and hasn't given any weight, so they might not be dry cf, so these would have to be custom), cf rear hatch, cf front bumper (replacement), cf rear bumper (NOTE: all cf would have to be dry cf to actually be worth it, also you could paint over the parts). Don't know how close you could get to 4.8. Nitrous would also help. Oh yeah, and a Technosquare full-spec ECU reflash.
My 2 cents.