2021 Audi A1 ABT for GTA 5. The 2021 Audi A1 ABT is a sporty compact hatchback developed by tuning house ABT Sportsline. The car has a beautiful and dynamic design that distinguishes it from the standard Audi A1. Externally, the 2021 Audi A1 ABT looks more aggressive and stylish thanks to sports body kits, larger bumpers, unique wheels and other details. Particularly attractive exterior elements are the sport exhaust pipes, aerodynamic elements and dynamic body lines.