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4/17/2021 | Park Jefferson International Speedway - Jefferson, SD Lucas Oil ASCS and RACESaver Sioux City Sprint Nationals plus IMCA Modifieds& Stock Cars 360 Sprints - Winged: ASCS National IMCA Modified, IMCA Stock Car, IMCA RaceSaver Sprint Car | Results | Brian Seibold (IMCA Stock Car) | 7th | - | - | 17th (DNF) |
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5/21/2021 | Wagner Speedway - Wagner, SD Week 3 Dirt Late Models, IMCA Northern SportMod, IMCA Stock Car, IMCA Hobby Stock, IMCA RaceSaver Sprint Car, IMCA Sport Compact | Results | Brian Seibold (IMCA Stock Car) | 5th | - | - | 6th |
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6/4/2021 | Park Jefferson International Speedway - Jefferson, SD $10,000 to win USMTS Challenge plus Stocks, Sp Mods, Hobbies A Modifieds: USMTS - United States Modified Touring Series B Modifieds, IMCA Northern SportMod, IMCA Stock Car, IMCA Hobby Stock | Results | Brian Seibold (IMCA Stock Car) | 5th | - | - | 8th |
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6/11/2021 | Crawford County Speedway - Denison, IA Regular Night All Classes-$1000 to win Modified and Sprint Cars. Sponsored by Finishline 305 Sprints - Winged, Hobby Stocks, Stock Cars, A Modifieds, B Modifieds, Hornets, Sport Compact | Results | Brian Seibold (Stock Cars) | 6th | - | - | 12th |
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6/18/2021 | Wagner Speedway - Wagner, SD Week 7 Dirt Late Models, IMCA Northern SportMod, IMCA Stock Car, IMCA Hobby Stock, IMCA RaceSaver Sprint Car, IMCA Sport Compact | Results | Brian Seibold (IMCA Stock Car) | 3rd | - | - | 4th (DNF) |
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6/27/2021 | Interstate Speedway (SD) - Jefferson, SD IMCA Weekly Series IMCA Modified: Midwest Madness Tour IMCA Northern SportMod, IMCA Stock Car, IMCA Hobby Stock, IMCA Sport Compact | Results | Brian Seibold (IMCA Stock Car) | 3rd | - | - | 20th (DNF) |
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7/16/2021 | Crawford County Speedway - Denison, IA Regular Night All Classes-$1000 to win Sport Mods 305 Sprints - Winged, Hobby Stocks, Stock Cars, A Modifieds, B Modifieds, Hornets | Results | Brian Seibold (Stock Cars) | 6th (DNF) | - | - | 9th |
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7/18/2021 | Interstate Speedway (SD) - Jefferson, SD IMCA Weekly Racing IMCA Modified, IMCA Northern SportMod, IMCA Stock Car, IMCA Hobby Stock, IMCA Sport Compact | Results | Brian Seibold (IMCA Stock Car) | 5th | - | - | 8th |
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7/23/2021 | Wagner Speedway - Wagner, SD Week 11 Dirt Late Models, IMCA Northern SportMod, IMCA Stock Car, IMCA Hobby Stock, IMCA RaceSaver Sprint Car, IMCA Sport Compact | Results | Brian Seibold (IMCA Stock Car) | - | - | - | 10th (DNF) |
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7/24/2021 | Worthington Speedway - Worthington, MN Regular Night Hobby Stocks, Stock Cars, Sportsmans, A Modifieds, B Modifieds, Sport Compact, IMCA Modified, IMCA Northern SportMod, IMCA Stock Car, IMCA Hobby Stock, IMCA Sport Compact | Results | Brian Seibold (Stock Cars) | DNS | - | - | DNS |
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8/6/2021 | Wagner Speedway - Wagner, SD Week 13 Hobby Stocks, Dirt Late Models, IMCA Northern SportMod, IMCA Stock Car, IMCA Hobby Stock, IMCA Sport Compact | Results | Brian Seibold (IMCA Stock Car) | 5th | - | - | 9th (DNF) |
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8/9/2021 | Park Jefferson International Speedway - Jefferson, SD J&J Fitting Iron Cup Night 1 B Modifieds, IMCA Modified, IMCA Northern SportMod, IMCA Stock Car, IMCA Hobby Stock, IMCA Sport Compact | Results | Brian Seibold (IMCA Stock Car) | 7th (DNF) | - | - | 19th (DNF) |
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8/22/2021 | Interstate Speedway (SD) - Jefferson, SD IMCA Weekly Racing IMCA Modified, IMCA Northern SportMod, IMCA Stock Car, IMCA Hobby Stock, IMCA Sport Compact | Results | Brian Seibold (IMCA Stock Car) | 6th | - | - | 11th |
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8/27/2021 | Wagner Speedway - Wagner, SD Championship Dirt Late Models, IMCA Northern SportMod, IMCA Stock Car, IMCA Hobby Stock, IMCA RaceSaver Sprint Car, IMCA Sport Compact | Results | Brian Seibold (IMCA Stock Car) | 6th (DNF) | - | - | 8th |
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8/29/2021 | Interstate Speedway (SD) - Jefferson, SD IMCA Weekly Racing IMCA Modified, IMCA Northern SportMod, IMCA Stock Car, IMCA Hobby Stock, IMCA Sport Compact | Results | Brian Seibold (IMCA Stock Car) | 6th | - | - | 10th |
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9/19/2021 | Interstate Speedway (SD) - Jefferson, SD IMCA Weekly Racing 305 Sprints - Winged, IMCA Modified, IMCA Northern SportMod, IMCA Stock Car, IMCA Hobby Stock, IMCA RaceSaver Sprint Car, IMCA Sport Compact | Results | Brian Seibold (IMCA Stock Car) | 6th | - | - | 8th |
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10/2/2021 | Interstate Speedway (SD) - Jefferson, SD SD Nationals IMCA Modified, IMCA Northern SportMod, IMCA Stock Car, IMCA Hobby Stock, IMCA Sport Compact | Results | Brian Seibold (IMCA Stock Car) | 6th | - | - | 8th |
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10/3/2021 | Interstate Speedway (SD) - Jefferson, SD SD Nationals IMCA Modified, IMCA Northern SportMod, IMCA Stock Car, IMCA Hobby Stock, IMCA Sport Compact | Results | Brian Seibold (IMCA Stock Car) | 3rd | - | - | 7th |
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10/9/2021 | Murray County Speedway - Slayton, MN Hub City Rumble - Repairable Vehicles.com Tri State Late Models Dirt Late Models: Tri-State Late Models Factory Stocks, Hobby Stocks, Stock Cars, A Modifieds, B Modifieds, Sport Compact | Results | Brian Seibold (Hobby Stocks) | - | - | - | - | Brian Seibold (Stock Cars) | 8th (DNF) | - | - | 14th |
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