Stage 1 would be a map to suit standard car / car with a few minor mods (uprated filter, diverter valve, silicone TIP etc).
Stage 2 would be a map to suit a car with uprated exhaust (downpipe, sports cat or de-cat) as well as induction etc above. FMIC usually fitted for Stage 2.
Stage 3 would probably be a hybrid or larger turbo with all the upgrades listed above and mapped to suit.
Yours probably has a stage 1 revo map and FMIC which will help you keep your power going longer, but would neccessarily add any extra power.
If I were you i'd sort the induction and exhaust and Stage 2 it!
People, feel free to correct me if i'm wrong.