Search our extensive catalogue for the required part:
Holley
Holley UK – Carburetors, EFI Systems & Performance Parts Holley is a legendary name in the world of performance. Since 1903, Holley has been at the forefront of fuelling technology, powering everything from classic hot rods to modern race cars....
-
Holley EFI 558-504
Holley EFI Universal V8 MPFI EFI Harness Kit
To complete your installation, we recommend including a...
Part TypeFuel Injection Harness£890.99£845.99 inc VAT£704.99 ex VAT -
Holley EFI 558-503
Holley EFI GM TPI and Stealth Ram EFI Harness Kit - GM TPI and Holley Stealth Ram™
NOTICE: You will need to purchase a ECU...
Part TypeFuel Injection Harness£890.99£845.99 inc VAT£704.99 ex VAT -
Holley EFI 558-502
Holley EFI GM LS 58X EFI HARNESS KIT - GM LS2/LS3/LS7, 58X Crank Sensor, Bosch Injector
NOTICE: You will need to purchase an ECU...
Part TypeFuel Injection Harness£995.99£938.99 inc VAT£782.49 ex VAT -
Holley EFI 558-501
Holley EFI GM 58X EFI HARNESS KIT - GM LS2/LS3/LS7, 58X Crank Sensor, USCAR/ EV6 Injector
NOTICE: You will need to purchase an ECU...
Part TypeFuel Injection Harness£943.99£892.99 inc VAT£744.16 ex VAT -
Holley EFI 558-500
Holley EFI GM LS 24X EFI HARNESS KIT - GM LS1/6, 24X Crank Sensor, Bosch Injector
NOTICE: You will need to purchase an ECU...
Part TypeFuel Injection Harness£1,049.99£1,000.99 inc VAT£834.16 ex VAT -
Holley EFI 558-499
Holley EFI Terminator X Max Transmission Kit - GM 6L80/6L90 - Requires Terminator X Max
Terminator X V3 software is not compatible with...
Part TypeAutomatic Transmission Wiring Harness£601.99£595.00 inc VAT£495.83 ex VAT -
Holley EFI 558-484
Holley EFI M8 Extension - 4ft
M8 Extension Harness for Sniper 2 - 4ft
Part TypeWiring Harness£47.99 inc VAT£39.99 ex VAT -
Holley EFI 558-482
Holley EFI Transmission Harness - TKO - Terminator X Max ECUs on V3 Build 100 or later
Requires: Terminator X Max ECU with V3 Build...
Part TypeManual Transmission Wiring Harness£239.99£220.00 inc VAT£183.33 ex VAT -
Holley EFI 558-481
Holley EFI Transmission Harness - T-56 - Terminator X Max ECUs on V3 Build 100 or later
Requires: Terminator X Max ECU with V3 Build...
Part TypeManual Transmission Wiring Harness£239.99£220.00 inc VAT£183.33 ex VAT -
Holley EFI 558-480
Holley EFI Transmission Harness - T-56 Magnum - Terminator X Max ECUs on V3 Build 100 or later
Requires: Terminator X Max ECU with V3 Build...
Part TypeManual Transmission Wiring Harness£239.99£220.00 inc VAT£183.33 ex VAT -
Holley EFI 558-475
Holley EFI GM PWM Alternator Harness
For use with 2007+ PWM GM Alternators.
Part TypeAlternator Harness£97.00 inc VAT£80.83 ex VAT -
Holley EFI 558-474
Holley EFI Ford Crank Sensor Module - Ford 7.3L Godzilla - HP, Dominator, and Terminator X ECU's
Requires Holley EFI V6 Build 300 or Terminator...
Part TypeEngine Crankshaft Position Sensor Wiring Harness£62.99 inc VAT£52.49 ex VAT -
Holley EFI 558-473
Holley EFI Transmission Control Harness - 1996-2003 Chrysler 46RE - Use with Terminator X Max only
Requires Terminator X firmware and Software V2 Build...
Part TypeAutomatic Transmission Wiring Harness£289.99£184.00 inc VAT£153.33 ex VAT -
Holley EFI 558-471
Holley EFI Transmission Control Harness - 1992-1997 Ford AODE/4R70W
Requires software version 5.0 build 100 or higher...
Part TypeAutomatic Transmission Wiring Harness£307.99£281.99 inc VAT£234.99 ex VAT -
Holley EFI 558-470
Holley EFI Transmission Control Harness - 1998+ Ford 4R70W/4R75W
Requires software version 4.0 build 32 or higher...
Part TypeAutomatic Transmission Wiring Harness£283.00£268.99 inc VAT£224.16 ex VAT -
Holley EFI 558-469
Holley EFI 2018-2022 Ford DBW Harness - Throttle Body
Throttle Body - JL3E-9F991-AA - Throttle Pedal -...
Part TypeWiring Harness£293.99£274.99 inc VAT£229.16 ex VAT -
Holley EFI 558-468
Holley EFI Terminator X DBW Harness - GM Gen V LTX
For LTx Throttle Bodies and Terminator X and...
Part TypeThrottle Body Wiring Harness£298.99£274.99 inc VAT£229.16 ex VAT -
Holley EFI 558-467Part TypeManifold Absolute Pressure Sensor Adapter
£37.99£25.99 inc VAT£21.66 ex VAT -
Holley EFI 558-466Part TypeManifold Absolute Pressure Sensor Adapter£52.00 inc VAT£43.33 ex VAT
-
Holley EFI 558-461
Holley EFI Ford GT500 and 3V Drive-by-Wire Throttle Body Harness
2005-2010 Ford Mustang GT and GT500 Models
Part TypeFuel Injection Harness£497.99£451.99 inc VAT£376.66 ex VAT -
Holley EFI 558-459
Holley EFI Terminator Stealth 2x4 Primary Throttle Body Sub Harness - Replacement harness
In almost all instances, the throttle bodies will...
Part TypeElectronic Throttle Harness£242.99£226.00 inc VAT£188.33 ex VAT -
Holley EFI 558-457
Holley EFI Pro Dash Standalone Service Harness
For standalone dashes
Part TypeDisplay Wiring Harness£380.99 inc VAT£317.49 ex VAT -
Holley EFI 558-456
Holley EFI Pro Dash Input/Output Harness - Unterminated input/output wiring
The installer can choose to match the color...
Part TypeElectronic Throttle Harness£289.99£289.00 inc VAT£240.83 ex VAT -
Holley EFI 558-455
Holley EFI Transmission Control Harness - 2009+ GM 4L60
When used with Dominator ECU - Requires software...
Part TypeAutomatic Transmission Wiring Harness£293.99£271.00 inc VAT£225.83 ex VAT -
Holley EFI 558-454
Holley EFI CAN Adapter Harness, 12'
12' Male to Female CAN Adapter Harness
Part TypeWiring Harness£103.00 inc VAT£85.83 ex VAT
Holley UK – Carburetors, EFI Systems & Performance Parts
Holley is a legendary name in the world of performance. Since 1903, Holley has been at the forefront of fuelling technology, powering everything from classic hot rods to modern race cars. Known for their carburetors, EFI systems, fuel pumps, and complete performance solutions, Holley remains the first choice for enthusiasts worldwide.
The Holley Legacy
Holley carburetors became an icon in American muscle cars and motorsport, appearing on millions of vehicles over the decades. Today, Holley’s reach extends far beyond carburetion, with a massive catalogue that includes EFI systems, intake manifolds, exhaust solutions, ignition systems, and even full fuel delivery kits.
Why Enthusiasts Choose Holley
- Unmatched History: Over 100 years of performance innovation.
- Complete Solutions: Everything from fuelling to exhaust under one brand family.
- Motorsport Proven: Trusted in drag racing, circle track, and street performance applications.
- Modern Technology: Cutting-edge EFI systems that bring classic builds into the future.
Popular Holley Products
- Holley 4150 & 4160 Carburetors
- Sniper EFI Conversion Kits
- Holley Terminator X Engine Management
- Fuel Pumps & Regulators
- Holley Intake Manifolds
Holley in the UK
Billy’s Speed Shop brings Holley performance parts to the UK, eliminating the cost and hassle of importing. Whether you’re restoring a classic V8, tuning a modern LS swap, or building a drag car, Holley offers the solutions you need – available now with fast UK delivery.
Fuel your project with Holley UK performance parts – order today at Billy’s Speed Shop.



