- First Generation (1998-2006)
- Launched as coupé in 1998, followed by roadster in 1999
- Based on Volkswagen Group A4 platform with 1.8L turbo engines
- First generation produced in Hungary with 662,762 units
- Named after Isle of Man TT motorcycle race
- Second Generation (2006-2014)
- Introduced in 2006 with aluminum front panels
- Available with 1.8L, 2.0L TFSI, 3.2L VR6 engines
- Features Audi Magnetic Ride suspension system
- First diesel version launched in 2008 with 2.0L TDI
- RS Variants (2009-2012)
- TT RS introduced with 2.5L turbo engine producing 340 PS
- Available with manual or 7-speed S-tronic transmission
- RS Plus version launched in 2012 with 360 PS engine
- Top speed limited to 280 km/h
- Third Generation (2014-2023)
- Final generation produced in 2023
- Features 1.8L, 2.0L FSI, 2.0L TDI engines
- Available as Coupé and Roadster
- Last production units manufactured in November 2023