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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....
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Holley EFI 558-130
Holley EFI LT4 Engine Main Harness
For use with Terminator X - Requires V3...
Part TypeEngine Control Module (ECM) Wiring Harness£602.99£559.99 inc VAT£466.66 ex VAT -
Holley EFI 558-129
Holley EFI Gen V LT Engine Main Harness
For use with Terminator X and X Max
Part TypeEngine Control Module (ECM) Wiring Harness£602.99£559.99 inc VAT£466.66 ex VAT -
Holley EFI 558-128
Holley EFI Ford Foxbody Main Harness
The following guide overviews all connections on the...
Part TypeEngine Wiring Harness£577.00£563.99 inc VAT£469.99 ex VAT -
Holley EFI 558-127
Holley EFI Benchtop Harness - Firmware Updating - Dash Configuration - ECU Testing
Firmware Updating - Dash Configuration - ECU Testing
Part TypeIgnition Harness£242.99£241.00 inc VAT£200.83 ex VAT -
Holley EFI 558-126
Holley EFI Unterminated 15' Flying Lead Main Harness
Pre-Terminated J1A / J1B 15' Flying Lead Main...
Part TypeEngine Wiring Harness£446.99£406.99 inc VAT£339.16 ex VAT -
Holley EFI 558-125
Holley EFI Ford Coyote Ti-VCT Sub Harness (2013-2017)
Designed to be used with 558-319 Main Power...
Part TypeEngine Wiring Harness£419.99£385.00 inc VAT£320.83 ex VAT -
Holley EFI 558-124
Holley EFI Ford Coyote Ti-VCT Sub Harness (2011-2012)
Designed to be used with 558-319 Main Power...
Part TypeEngine Wiring Harness£286.00£262.00 inc VAT£218.33 ex VAT -
Holley EFI 558-122
Holley EFI Coyote Ti-VCT Main Harness for Holley EFI HP Smart Coils (2011-2017)
Requires MAP Sensor P/N 538-24 Designed to be...
Part TypeEngine Wiring Harness£995.99£902.99 inc VAT£752.49 ex VAT -
Holley EFI 558-121
Holley EFI Terminator Stealth 2x4 Main Harness
Easily convert from single to dual Terminator Stealth
Part TypeElectronic Throttle Harness£523.99£499.99 inc VAT£416.66 ex VAT -
Holley EFI 558-118Part TypeIgnition Harness
£665.99£634.99 inc VAT£529.16 ex VAT -
Holley EFI 558-117
Holley EFI Universal MPFI Coil On Plug Main Harness
UNIVERSAL MPFI W/ COP MAIN HARNESS
Part TypeIgnition Harness£613.99£586.00 inc VAT£488.33 ex VAT -
Holley EFI 558-116
Holley EFI Gen III HEMI Main Harness Late w/ TPS and Idle Air Control Connections
Note: The TPS and IAC connectors are designed...
Part TypeFuel Injection Harness£839.99£799.00 inc VAT£665.83 ex VAT -
Holley EFI 558-115
Holley EFI Gen III Hemi Main Harness Early w/ TPS and Idle Air Control Connections
NOTE: The TPS and IAC connectors are designed...
Part TypeFuel Injection Harness£890.99£845.99 inc VAT£704.99 ex VAT -
Holley EFI 558-113
Ford Modular 2V and 4V Main Harness for use with Holley Smart Coils
Main Harness for 1999-2004 2 & 4 Valve...
Part TypeIgnition Harness£943.99£892.99 inc VAT£744.16 ex VAT -
Holley EFI 558-112
Holley EFI Main Engine Harness for 58x LS w/ TBI
Used with 58x/4x Gen 4 LS with Terminator...
Part TypeFuel Injection Harness£716.99£683.99 inc VAT£569.99 ex VAT -
Holley EFI 558-111
Holley EFI Main Engine Harness for 24x LS w/ TBI
Only compatible with Terminator TBI throttle bodies and...
Part TypeFuel Injection Harness£733.99£704.99 inc VAT£587.49 ex VAT -
Holley EFI 558-110
Holley EFI Ford Coyote Engine Main Harness w/ Ti-VCT and Stock Coils (2011-2017)
Requires MAP Sensor P/N 538-24 When utilizing this...
Part TypeEngine Wiring Harness£890.99£812.99 inc VAT£677.49 ex VAT -
Holley EFI 558-108
Holley EFI Ford 2V and 4V Modular Main Harness
Ford 2V & 4V Modular Main Harness, For...
Part TypeFuel Injection Harness£818.99£799.00 inc VAT£665.83 ex VAT -
Holley EFI 558-105
Holley EFI Unterminated Universal Main Harness
Unterminated Universal Main Harness for HP EFI &...
Part TypeFuel Injection Harness£562.99£538.00 inc VAT£448.33 ex VAT -
Holley EFI 558-104
Holley EFI Universal MPFI Main Harness
Universal MPFI Main Harness for HP EFI &...
Part TypeFuel Injection Harness£562.99£538.00 inc VAT£448.33 ex VAT -
Holley EFI 558-102
Holley EFI LS1/6 (24x/1x) Engine Main Harness
LS1/6 Main Harness for HP EFI & Dominator...
Part TypeFuel Injection Harness£665.99£634.99 inc VAT£529.16 ex VAT -
Holley EFI 558-101
Holley EFI TPI/Stealth Ram Main Harness
TPI/Stealth Ram™ Main Harness for Avenger EFI, HP...
Part TypeFuel Injection Harness£665.99£634.99 inc VAT£529.16 ex VAT -
Holley EFI 557-202
Holley EFI High Flow Dual Solenoid - Replacement service part
When selecting solenoid configuration in the Holley EFI...
Part TypeTurbocharger Electronic Boost Controller£151.00£148.99 inc VAT£124.16 ex VAT -
Holley EFI 557-201
Holley EFI High Flow Dual Solenoid Boost Control Kit
When selecting solenoid configuration in the Holley EFI...
Part TypeTurbocharger Electronic Boost Controller£472.00£433.00 inc VAT£360.83 ex VAT -
Holley EFI 557-200
Holley EFI 3 Port Boost Control Solenoid
Solenoid is driven directly from a Pulse Width...
Part TypeTurbocharger Electronic Boost Controller£191.99£133.99 inc VAT£111.66 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.



