Yes, and EGR delete/defeat, then the Hot water Bypass (if your ride has an aluminum intake manifold; no need if it's composite). Port and polish of upper and lower intakes gets air in smoother. All of these contribute to a cooler/denser air charge.
I've also seen/heard of a PCV re-route to preserve intake manifold vacuum (T it into the breather line, and then cap the source on the intake manifold - shouldn't -some say doesn't; I agree- contravene EPA, because the gasses are still getting routed back into the engine; just at a different place than the designers intended).
There's also the throttle cable mod, so that your throttle plate is truly wide open when your pedal is mashed to the floor.
have we mentioned a cooler thermostat? 180 degrees rather than stock 195 helps. (Pair this with Underdrive Pulley)
31s with my 4.10 made a tangible difference...make sure you get your ECU re-flashed so speedo/odo is correct; your tires won't be making as many revs per mile.
you can also play with your spark plug gap (increasing it to advance timing).
None of these should trigger a MIL/CEL, putting your ride into limp mode.
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