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David "Duffy" Duffield

  • Limited Street Winner

    Winner 2025 Import Vs Domestic World Cup Finals at MIR

    Number 1 Qualifier

    Limited street Class Winner

    3rd year competing at WCF

    7.34 @184mph

    Watch now
  • 2jz drag car

    7 Second S14

    Built 2JZ

    Sponsors: Sleeper Tuning, Sunoco Race Fuel, Garrett Motion, Schmuck Built, Link ECU, El's Tires, Fast Fab performance, Brian Roche Racing Engines, Viteo Racing Transmissions, C2 Competition Converters, Positive Performance Center, Northeast Body Shop, Wilmington, DE - New Paint for 2024 - Katsura Orange

  • Nopi MIR s14 lineup

    2025 Nopi Nationals at MIR

    The return of Nopi

    2nd Place - XRWD class

    ET 7.68 at 183.37

  • Pan American Nationals

    2025 Pan American Nationals

    2nd year XStreet class

    Number One Qualifier

    ET 7.776 at 181.42mph

    Watch now
  • WCF2024

    2024 Import VS Domestic World Cup Finals

    2nd year

    2nd place Limited Street Class

    Number one qualifier

    Watch now
  • 2024 pan am

    2024 Pan American Nationals

    Number 1 Qualifier X-Street class

    2nd Place

    Watch now
  • WCF 2023

    2023 World Cup Finals

    Qualified in Wild Street Class

    Watch now
  • cecil

    Cecil County Dragway

    Catch us testing at our home track.

    Watch now
  • duffy

    Follow Duffy on Social Media

    IG @duffy_davee

    FB David Scott Duffield

    Meet Dave

  • 2JZ power

    Dart block

    3.2 stroker

    watch the build

Jorge Batiz

  • 240sx

    800hp RB25DET 240sx

    Sponsors: Sleeper Tuning

    Catch Jorge all season racing with RaceMotive roll racing events at Pocono Raceway and Maple Grove Raceway

  • Roll Racing Pocono Raceway

    2024 RaceMotive Roll Race Winner

    Placed 1st 150mph class (1/3 mile 159.99 mph)

    Watch us race at Pocono
  • rb25det

    RB25DET

    Fully built in house

    Watch here
  • Clean 240sx

    Show Worthy

    Jorge keeps meticulous care of his car despite racing it every chance he gets

    Watch him race

  • Link 5" Dash Display

    simplify your life

    shop

Josh Gunnet

Luis Valentin

  • rb25det engine

    RB25DET

    Sleeper Built in house

    Garrett G35-1050

    880whp

    Watch Short
  • Race won

    Winner of RaceMotives King of the North

    150-159 class winner

  • silvia

    880whp RB25DET Nissan Silvia

    Follow Luis on IG

  • Link ECU

    Running Link ECU G4X

    Shop now

  • Seat time

    First roll race of the 2025 season

    RaceMotive at Pocono Raceway

    click to watch

Giving Back.

UD Blue Hen Racing

(Sponsorship) 2025 - Current

Link ECU G4X -FuryX

We believe in giving back to our community. Here at Sleeper we are continuing support of the UDFASE team through 2026.

UDFSAE cart dyno

”On behalf of our entire team, I want to thank you for your tremendous support this past season. Your sponsorship played a vital role in having a successful 2026 Formula SAE competition, and allowing us to show off the team’s incredible hard work throughout the year. We are proud to say we finished all dynamic and static events for the first time since 2019, finishing in the top 70 out of nearly 150 universities. “

UDFSAE sponsorship

‘We are the University of Delaware's formula student team. We took our student built car to Edgar at Sleeper Tuning to be put on the dyno. For an in house built race car with miscellaneous parts, his diagnosing skills were extremely impressive and the sharing of his knowledge was extremely beneficial to our team. Not only did he dyno our car but he significantly improved the cars drivability and performance. He shared his knowledge willingly and wanted to see us improve. We would recommend him to anyone looking for the services he provides.” -UD FSAE Blue Hen Racing