1991 / Interserie
Apr
14
1991 Interserie Hockenheim
Hockenheimring
May
12
1991 Interserie Nürburgring
Nürburgring Sprint Circuit
May
26
1991 Interserie Zeltweg
Zeltweg Airfield
Jul
28
1991 Interserie Brands Hatch
Brands Hatch Indy Circuit
Aug
11
1991 Interserie Most
Autodrom Most
Sep
15
1991 Interserie Siegerland
Siegerlandring
Oct
13
1991 Interserie Zeltweg 2
Zeltweg Airfield