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First, congrats on the car. I have the same except for the ZF auto (AWD).
While I don't have ACN here in Canada, I did compare 91 to 93. There is a definite difference between Stage 1 and stock. You will feel it right away. 93 is better, but Stage 1 is definitely an improvement over stock.
Stay with the OEM plugs, or Bosch equivalent. Our plugs are 1 stage colder than the N54 plugs and will suffice through to Stage 2. Any more mods than that get the NGK 97506.
I did my transmission flush at about 80K (get the FCPEuro kit).
Change your oil more regularly once tuned. I do mine about every 6000 miles.
Chris
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