I apologize for the noob question. I have a 2012 C7 A6 3.0TFSI, have had it for almost 4 months now.
I'm looking to do some performance mods in the near future. Like intake, exhaust, pulley, tune, etc.
Can anyone please explain the different stages of upgrade and what you need to do or have on the car for stage 1, stage 2 and so on ?
Thanks !

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