A non-championship one-off race was held in 2004 at the streets of Shanghai, China.

Well in his 50s, Asch has returned to the German Porsche Carrera Cup, where he raced until 2003, bar a one-off race during the 2004 season.

The FIA European Formula Three Cup, a one-off race (1985 - 1990, 1999 - 2002)

As of 2006 he was semi-retired, but won a one-off race in the Suzuki GSX-R Cup at Misano in June 2006.

Furthermore Tom is often invited to join one-off races like the 24 hours at the Nürburgring.

P. J. Jones also ran a one-off race for HOF Racing at Watkins Glen, finishing 37th.

He also took part in the F3 European Cup in 2002, finishing the one-off race in thirteenth place.

He also offers the opinion that being a one-off race meant the team did not get to practise under the competitive conditions of running in a heat and semi-final first.

From 2003 to 2005 Bonanomi focussed on Formula Three competing in the Italian championship and the Euro Series, as well as a number of one-off races.

- A non-championship one-off race was held in 2004, in Shanghai, China.