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ECU & Harnesses

ECU & Harnesses are the brains and wiring backbone of any EFI conversion. Whether standalone or piggyback, these units offer full control over fuel mapping, sensor inputs, and injector timing—vital for tuning modern engines.
Original price $5,292.10 - Original price $5,292.10
Original price
$5,292.10
$5,292.10 - $5,292.10
Current price $5,292.10
+ GST

Holley HP EFI ECU & Harness Kit (HO550-603)

HP EFI ECU WITH HARNESSSuit LS2/LS3/LS7 (58x Tooth Crank Sensor)Part Number: HO550-603 Looking for a plug and playkit for your GM LS engine? TheHP...

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Original price $5,292.10 - Original price $5,292.10
Original price
$5,292.10
$5,292.10 - $5,292.10
Current price $5,292.10
+ GST
Contact for availability
Original price $4,630.40 - Original price $4,630.40
Original price
$4,630.40
$4,630.40 - $4,630.40
Current price $4,630.40
+ GST

Holley Terminator X Max ECU Kit, 24x Crank - 1x Cam - EV1 Injectors (HO550-916)

HO550-916 - TERMINATOR X MAX ECU KIT, LS1Suit GM LS1/LS6Part Number: HO550-916Take control of your LS engine with Terminator X Max! Don't settle fo...

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Original price $4,630.40 - Original price $4,630.40
Original price
$4,630.40
$4,630.40 - $4,630.40
Current price $4,630.40
+ GST
Contact for availability
Original price $726.00 - Original price $726.00
Original price
$726.00
$726.00 - $726.00
Current price $726.00
+ GST

MSD Atomic Replacement Hand Controller Module (MSD2912)

REPLACEMENT HAND CONTROLLERSuit MSD2900 & MSD2910 Atomic TBI EFI KitsPart Number: MSD2912 The Atomic’s handheld monitor gives you access to ...

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Original price $726.00 - Original price $726.00
Original price
$726.00
$726.00 - $726.00
Current price $726.00
+ GST
Contact for availability
Original price $246.50 - Original price $246.50
Original price
$246.50
$246.50 - $246.50
Current price $246.50
+ GST

Holley Auxiliary Harness - J2B Connector (HO558-402)

HO558-402 - J2B P2B ECU EFI DOMINATORSuit Dominator EFIPart Number: HO558-402HARNESS KIT INCLUDES: Loose wires with pre-crimped ECU pins for the fo...

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Original price $246.50 - Original price $246.50
Original price
$246.50
$246.50 - $246.50
Current price $246.50
+ GST
Contact for availability
Original price $333.20 - Original price $333.20
Original price
$333.20
$333.20 - $333.20
Current price $333.20
+ GST

Holley Auxiliary Harness - J2A Connector (HO558-401)

HO558-401 - P2A J2A EFI DOMINATOR AUXSuit Dominator EFIPart Number: HO558-401HARNESS KIT INCLUDES: J2A ECU Connector#2 Wide band oxygen sensor harn...

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Original price $333.20 - Original price $333.20
Original price
$333.20
$333.20 - $333.20
Current price $333.20
+ GST
Contact for availability
Original price $879.20 - Original price $879.20
Original price
$879.20
$879.20 - $879.20
Current price $879.20
+ GST

Holley 3.5" LCD Touch Screen (HO553-108)

HOLLEY EFI 3.5" TOUCH LCD SCRNSuit Holley EFIPart Number: HO553-108 The touch screen LCD provides a dynamic range of tuning and data monitoring op...

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Original price $879.20 - Original price $879.20
Original price
$879.20
$879.20 - $879.20
Current price $879.20
+ GST
Contact for availability