GENERALLY SPEAKING, here is what the various stages are:
Stage 0 = engine management alone
Stage 1 = engine management alone
Stage 2 = turboback exhaust + engine management
Stage 2+ = stage 2 + a few other bolt ons
Stage 4 = small bolt on turbo+ fueling + turboback exhaust + engine management
Stage 5 = anything above stage 4
While these are generalizations, DO NOT fall into the trap of labeling
your car as a "Stage X" and expect people to magically know what you are talking about. Post specifics such as "I have a Cobb Stage 2" or "I have a
TurboXS Stage 4", or better yet...forget stages and post 100% of your mods.