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lots of stuff. heads, intake manifold, headers/exhaust, different gears, the list goes on. depends on your budget really if youre gonna make a big difference. check out summit.com for some ideas
Not to hijack but- let's discuss a broad spectrum of ways to improve performance.
1. And most important: Diagnose and repair all mechanical defects and impedaments. If you have bad injectors, melted plugs, shorted wires, clogged air filter, crude viscosity oil, 1/2 a quart of rear diff oil, hanging breaks or warped rotors, bad bearing, Under inflated tires, mismatched gear/tire ratios, extra weight (300lbs of junk and work clothes in your tool box), poor alignment or any other of a hundred regular maintenance projects. A BUNCH of performance comes from the basic ability to PERFORM.
2. Basic upgrades: Highflow exhaust, HF/cold air cleaner, synthetic lube and oils, performance plugs coil and wires, tunes.
3. Hard upgrades: Heads, cam, intake, higher compression, added cubes.
4. Power adders: Turbo, supercharger, N02.
How realistic are 3. and 4. for DD's? I'm considering a SC for my 5.0.