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The engine internals can handle a lot of power, so if you don't plan on pushing more than 19-20psi of boost you don't have to build up the bottom end. A 2003? I would strengthen the differential because they have been known to blow up on that year. Exhaust, intake, cams, port/polished head, intake manifold, high-flow cat, coil-overs, better tires, SAFC with a reflashed/new ECU, boost control, turbo timer, different turbo manifold/upgraded turbo, lighter flywheel, stronger 2 or 3 stage clutch, stronger/bigger brakes, etc. That should keep you busy for a while. If you want to boost more, open the engine up, go with dished pistons for lower compression (and higher boost for larger effective compression), stronger rods, different heads (race heads), billet crank, etc. That should keep you going even longer.
If I forget something, forgive me.
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