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| 4/17/2021 | 141 Speedway - Maribel, WI 141 Championship Cup Opener Stock Cars, Sportsmans, Sport Compact, IMCA Modified, IMCA Northern SportMod, IMCA Stock Car | Results | | Paul Diefenthaler (IMCA Stock Car) | 7th | - | 4th | 18th |
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| 5/1/2021 | 141 Speedway - Maribel, WI Salute to Armed Forces / 141 Championship Cup Race #3 Stock Cars, Sportsmans, Sport Compact, IMCA Modified, IMCA Northern SportMod, IMCA Stock Car | Results | | Paul Diefenthaler (IMCA Stock Car) | 2nd | - | - | 21st |
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| 5/29/2021 | 141 Speedway - Maribel, WI Nathan Bouche Memorial / $1,000.00 to Win Stock Cars Triple Creek Series / 141 Championship Cup #7 Stock Cars, Sportsmans, Sport Compact, IMCA Modified, IMCA Northern SportMod, IMCA Stock Car | Results | | Paul Diefenthaler (Sportsmans) | 2nd | - | - | 11th |
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| 7/17/2021 | 141 Speedway - Maribel, WI Pepsi Fan Appreciation Free Corn Feed / 141 Championship Cup Race #12 Stock Cars, Sportsmans, Sport Compact, IMCA Modified, IMCA Northern SportMod, IMCA Stock Car | Results | | Paul Diefenthaler (Sportsmans) | 1st | - | - | 1st |
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| 7/18/2021 | Luxy Raceway - Luxemburg, WI Eric Van Iten Memorial Night Street Stocks, IMCA Modified, IMCA Northern SportMod, IMCA Stock Car | Results | | Paul Diefenthaler (Street Stocks) | 3rd | - | - | 1st |
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| 7/20/2021 | 141 Speedway - Maribel, WI King of the Creek IV Practice Plus White" Race $1,000.00 to Win Street Stocks Stock Cars, Sportsmans, Sport Compact, IMCA Modified, IMCA Northern SportMod, IMCA Stock Car | Results | | Paul Diefenthaler (Sportsmans) | 5th | - | - | 1st |
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| 7/30/2021 | Outagamie Speedway - Seymour, WI Racing History joins EWSC at Outagamie Speedway Street Stocks, IMCA Modified, IMCA Northern SportMod, IMCA Stock Car, IMCA Sport Compact | Results | | Paul Diefenthaler (Street Stocks) | 7th (DNF) | - | - | 3rd |
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| 7/31/2021 | 141 Speedway - Maribel, WI FZE Manufacturing Solutions Presents Powder Puff Races / 141 Championship Cup Race #13 Stock Cars, Sportsmans, Sport Compact, IMCA Modified, IMCA Northern SportMod, IMCA Stock Car | Rain Out |
| 8/1/2021 | Luxy Raceway - Luxemburg, WI Village Kitchen Presents Mod Mania! Street Stocks, Sport Compact, IMCA Modified, IMCA Northern SportMod, IMCA Stock Car | Results | | Paul Diefenthaler (Street Stocks) | 5th | - | - | 1st |
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| 8/14/2021 | 141 Speedway - Maribel, WI Mechanics Races / Triple Creek Series $1,000.00 to Win Stock Cars / CC #14 Stock Cars, Sportsmans, Sport Compact, IMCA Modified, IMCA Northern SportMod, IMCA Stock Car | Results | | Paul Diefenthaler (Sportsmans) | 2nd | - | - | 4th |
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| 8/15/2021 | Luxy Raceway - Luxemburg, WI Gandrud Auto Group Presents: Back to School Night featuring Backpack Giveaway Street Stocks, Sport Compact, IMCA Modified, IMCA Northern SportMod, IMCA Stock Car | Results | | Paul Diefenthaler (Street Stocks) | 3rd | - | - | 5th |
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| 8/17/2021 | 141 Speedway - Maribel, WI Captain of the Creek III Practice Night / "Blue" Race $1,000.00 to Win Street Stocks Sportsmans | Results | | Paul Diefenthaler (Sportsmans) | 1st | - | - | 5th |
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| 8/22/2021 | Luxy Raceway - Luxemburg, WI Robinson Inc Night at the Races Street Stocks, Sport Compact, IMCA Modified, IMCA Northern SportMod, IMCA Stock Car | Results | | Paul Diefenthaler (Street Stocks) | 5th | - | - | 4th |
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| 8/29/2021 | Luxy Raceway - Luxemburg, WI Championship Night Street Stocks, Sport Compact, IMCA Modified, IMCA Northern SportMod, IMCA Stock Car | Results | | Paul Diefenthaler (Street Stocks) | 2nd | - | - | 10th |
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| 9/5/2021 | 141 Speedway - Maribel, WI Sunday Funday - IRA Bumper to Bumper Sprint Cars with Grand Nationals, Street Stocks and Legends 410 Sprints - Winged: IRA Interstate Racing Association Stock Cars, Sportsmans | Results | | Paul Diefenthaler (Sportsmans) | 3rd | - | - | 1st |
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| 9/18/2021 | Outagamie Speedway - Seymour, WI 2021 FALL BRAWL presented by KLINK EQUIPMENT Street Stocks, Dirt Late Models, Baby Grand, IMCA Modified, IMCA Northern SportMod, IMCA Stock Car, IMCA Sport Compact | Results | | Paul Diefenthaler (Street Stocks) | 2nd | - | - | 12th (DNF) |
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| 9/24/2021 | 141 Speedway - Maribel, WI 12th Annual Treek Strong Creek Classic / "Blue" Race $1,000.00 to Win IMCA Modifieds Stock Cars, Sportsmans, Sport Compact, IMCA Modified, IMCA Northern SportMod, IMCA Stock Car | Results | | Paul Diefenthaler (Sportsmans) | 7th | - | 1st | 2nd |
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| 9/25/2021 | 141 Speedway - Maribel, WI 12th Annual Treek Strong Creek Classic Stock Cars, Sportsmans, Sport Compact, IMCA Modified, IMCA Northern SportMod, IMCA Stock Car | Results | | Paul Diefenthaler (Sportsmans) | 3rd | - | 1st | 6th |
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| 10/8/2021 | Sk Speedway - Unity, WI SK Clash Stock Cars, A Modifieds, B Modifieds, Street Stocks, Hornets, Dirt 4 cyl Modifieds, Super Stocks, Pure Stock | Results | | Paul Diefenthaler (Street Stocks) | 2nd | - | - | 1st |
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