In 1992 he won the German Formula Three Championship B-Cup.
Driving a privately entered Audi A4 with the quattro 4-Wheel-Drive as this was banned for factory entrants, he won the German Supertouring Championship (STW) in 1999, the last season of this series, under controversial circumstances, taking the title only after the STW annulled the last lap of the final round of the Nürburgring.
Still considered as privateers, Abt entered the new Deutsche Tourenwagen Masters with hastily built cars similar to Audi TT. When driving an Audi R8 for Joest Racing at the 24 Hours of Le Mans that year, Abt called no other than Roland Asch to step in.
Complete 24 Hours of Le Mans results
|1999||Audi Sport UK Ltd.|| Stefan Johansson
|2000||Audi Sport Team Joest|| Michele Alboreto
Complete Deutsche Tourenwagen Masters results
(key) (Races in bold indicate pole position) (Races in italics indicate fastest lap)
1 - Shanghai was a non-championship round.
- † — Retired, but was classified as he completed 90% of the winner's race distance.