Order Status & Returns
Gift Cards
Help Center
1-800-345-4545
Vehicle Info NeededHOLLEYPART NUMBER: 510-558-121
558-121 Terminator Stealth 2x4 Main Harness
$53195
Ships on 09/08/2026
Lowest Price GuaranteeMain Harness
- Terminator Stealth 2x4 Main Harness
- Replaces Terminator Stealth Harness when Adding a 2nd Throttle Body
This harness is designed to complete the installation of a Terminator Stealth 2x4 slave throttle body with an existing Terminator Stealth system to have an EFI dual throttle body system and maintain a classic 4150 carb look. Fully assembled, this plug-and-play main harness will provide for a simple installation and a clean and professional appearance.
Emissions Note:
This part is only legal for sale and use on Uncontrolled (Non-Emissions Controlled) Vehicles or on vehicles used solely for the purposes of closed competition racing.
CLICK THIS LINK FOR IMPORTANT CARB & EPA EMISSIONS INFORMATION ABOUT THIS PART
Part TypeFuel Injection Wiring Harness
BrandHOLLEY
Package Height5.0
Package Width14.0
Package Length14.0
Weight4.0 PG
Part CategoryPerformance Parts
QuantitySold individually
Injection StyleThrottle body
Part FitmentSemi Universal
Package Qty1
Package TypeEA
No Questions
No Reviews
Items You Need
![Heavy-Duty Nitrile Gloves [7 mils Thick, Large]](https://www.jegs.com/images/mini_200/500/555/555-1124.jpg)
![Fender Cover with Pocket [23 in. W x 31 1/2 in. L]](https://www.jegs.com/images/mini_200/500/555/555-65010.jpg)
JEGS
Fender Cover with Pocket [23 in. W x 31 1/2 in. L]
Part Number : 555-65010
$1499$16.99
You Save$2.00
![Colored Electrical Tape [5 pack]](https://www.jegs.com/images/mini_200/500/555/555-w549.jpg)
![Wire Crimping Tool For Open Barrel Terminals, Weatherpack & Deutsch Crimps [Crimps 14 to 24 Gauge Wire]](https://www.jegs.com/images/mini_200/500/555/555-80566.jpg)
JEGS
Wire Crimping Tool For Open Barrel Terminals, Weatherpack & Deutsch Crimps [Crimps 14 to 24 Gauge Wire]
Part Number : 555-80566
$3599$39.99
You Save$4.00
![Magnetic Fender Cover [23 in. W x 34 in. L]](https://www.jegs.com/images/mini_200/500/555/555-65012.jpg)
JEGS
Part Number : 555-65010
$1499$16.99
You Save$2.00
Some parts are not legal for use in California or other states with similar laws / regulations
