ThatRacingChannel has sent us this video of the alleged world's fastest Audi S4 in action setting a quarter mile time of 9:61.
Owned by USP Motorsports, the Audi S4 (B5) was at the Palm Beach International Raceway in Jupiter, Florida for a test and tune track night. They were able to get off this first run before it started to rain.
Packing 800+whp, the S4 had its 2.7-liter twin-turbo engine swapped out in favor of a Volkswagen VR6 24v longitudinally mounted engine with a Precision 67mm turbo and Haltech engine managment running E85 fuel.
According to ThatRacingChannel, "This is North America's fastest Audi and to our knowledge the worlds fastest S4."