RE: a6 tuning?
As far as the chips go... most tuners will need to know the code on your ECU to place the proper hardware in the box. But most companies that offer S4 chips offer A6 chips as well. Products like intakes, DV's, TBB's or Bipipes will interchange between the S4 and A6, but exhaust products will not. Hope this helps out some.
Andy
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2001 Ebony Pearl A6 2.7T Sport
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