Audi's S4 seems to be quite attractive for tuning companies out there, especially for German houses who struggle to get more power from the existing 3.0-liter TFSI engine. After both Wettstetten and ...
ABT Sportsline is already offering certain conversion packages for the Audi S4 and RS4, but their latest work revolves around the regular A4 models, of the B9 generation. With their own engine control ...
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