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Guys stop arguing lol.
This is it:
Stage 0: stock
Stage 1: any bolts ons besides turbo or downpipe and tune
Stage 2: downpipe and any other mods besides turbo
Stage 3: hybrid turbo
Stage 4: full frame turbo
Fueling is irrelevant. Tune and E40 is stage one. Add downpipe and it's stage 2.
At least that's the case for German cars. I haven't had a factory turbo Japanese.
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