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The way I see it is that
Stage 1 - Stock everything with just a tune. ie....just a tune
Stage 2 - Intake/Header/Downpipe mods and a tune
Stage 3 - FI or redoing your stock FI setup.
To put it into APR/VW terms
Stage 1 - Tune
Stage 2 - Intake/Downpipe and Tune
Stage 3 - K04/GT25/GT27/GT30 (or GTX) and tune
Source: owned a mk4 gti and mk6 gti
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