At the end of the season, he decided to retire from professional racing.

As a result of this case, he quit professional racing.

In October 2007 he reclassified as an amateur and 30 years of professional racing came to an end.

That season was apparently his last in professional racing.

Filip was suspended from professional racing based on his positive test result until 14 January 2006.

Renthal has had ties to professional and amateur racing since the early days of the company.

Nevertheless, he drew in the crowds and would retire from professional racing at the end of the season.

Due to the extent of his injuries it was predicted that he would be unable to return to professional racing.

It has been used in professional racing since 1972.

From 1937 to 1939 he competed in professional racing.