I'm not sure how you're classifying stages. It seems that different tuners have different "stages."

The recognized AW levels are:
1 - chip
2 - chip, exhaust
2+ - chip, exhaust, dp's
3 - chip, exhaust, dp's, KO4 turbos and the fueling setup that goes with them.

Of course, there are a junkload of other small mods that should be done along with these basic "stages."

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B5 S4 - Laser Red is the fastest color...accept the truth.

AWE Twin1 / AWE DTS / Piggie shifter / APR snub mount / 710n / 17" Flik Lex / Sumitomo HTR Z / 35% tint / hardwired V1 / factory spoiler / red leather shift knob / coin holder / 08 Elantra "Bonzai the Hyundai" sidekick