Caporegime
Who invented these stages. Bunch of nonsense
Depends entirely on the context. In the Saab World a Stage 1 9-5 Aero is simply a remap whereas a Stage 3 is one with a 3" downpipe and uprated pressure regulator. Then again in the Celica world the stage nonsense is just not used! It is pretty much either stock engine or forged engine!