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Item #:
78197365
Holley EFI 550-931 Fuel Injection System
95% of respondents would recommend this to a friend
Item #:
78197365
IMP 2318
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Imported from USA store
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Only 7 items left in stock.
Order now and get it around Friday, November 06
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What Stands Out
Advanced Tuning
The Holley EFI 550-931 offers unparalleled tuning capabilities with an intuitive interface, allowing users to easily adjust parameters for optimal performance and efficiency, tailored to their specific vehicle requirements.
High Performance
Designed for horsepower enthusiasts, this fuel injection system boosts engine power output significantly while maintaining fuel efficiency, making it perfect for racers and high-performance builds seeking reliability and enhanced throttle response.
Comprehensive Compatibility
Compatible with various engine configurations, the Holley EFI 550-931 seamlessly integrates with existing setups, eliminating the need for extensive modifications and ensuring a hassle-free installation process for a wide range of users.
Product Details
- GM LS 58x Crank, 4x Cam - 4.8/5.3/6.0 Truck Engines- EV6 Injectors - Drive-By-Wire Throttle Body Control, No Laptop Required, 3.5 in. Touchscreen Included;Take control of your LS engine with Terminator X Max! Don't settle for a junkyard ECU with a cumbersome tuning interface when you can have complete control of your engine, self-learning fuel strategies and the proven, race-winning technology of Holley EFI at a budget-friendly price! Terminator X Max features real-time fuel learn, high impedance injector drivers, an integrated 1bar MAP sensor, and 4 programmable inputs and outputs. The inputs and outputs are ideal for electric fans, boost control solenoids, progressive NOS control, and much more. Part number 550-931 also has Drive-By Wire Throttle Body control. Terminator X Max comes fully loaded with base maps for common LS engine combinations to get you out of the garage and on the road/track fast. The 3.5 in. touch screen LCD handheld contains an easy to use calibration wizard as well as tuning and gauge display functions. Also included is Holley EFI's industry-leading, easy to use software suite that allows full laptop access for advanced users. Whether you are building a budget beater or a boosted race car, Terminator X MAX has the features and technology you need at a price that won't break the bank!;
| Compatible cars | GM LS 4.8/5.3/6.0 Truck Engines and LS2/LS3 with 58x Crank, 4x Cam and a Drive-By-Wire Throttle Body, with EV6 Injectors |
| Vehicle make | GM |
| Vehicle model | 4.8, 5.3, 6.0 LS Truck Engines |
| Fuel injection accessory & part type | Fuel Injection System |
| Brand | Holley EFI |
| Automotive parts division | Performance |
| Vehicle fitment type | Specific |
| Items included | 58x, 4x LS Engine Main Harness - EV6 Injector Harness - DBW Throttle Body Harness - Terminator X MAX ECU - ECU Main Power Harness - Bosch LSU 4.9 Wideband Oxygen Sensor - Input, Output Harness - and assorted vacuum adapters. |
| Accessories | 58x/4x LS Engine Main Harness - EV6 Injector Harness - DBW Throttle Body Harness - Terminator X MAX ECU - ECU Main Power Harness - Bosch LSU 4.9 Wideband Oxygen Sensor - Input/Output Harness - and assorted vacuum adapters |
| Features | Easy To Use |
| Series | Terminator X Max |
| Model | 550-931 |
| Weight | 9.2 lb (4.17 kg) |
| Vehicle type | Truck |
| Volts | 12 Volts |
| Multipack quantity | 1 |
Dangerous Goods
To avoid the delay in customs clearance process for Dangerous Goods, the shipment shall be opened at our warehouse facility to check the severity of hazardous components. Please see the list of Dangerous goods here.
Who Should Buy?
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Performance Enthusiasts
Ideal for car enthusiasts looking to maximize engine performance with advanced fuel management and control features.
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Modern Engine Swaps
Perfect for those swapping modern engines into classic cars, enhancing efficiency and power with updated technology.
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Custom Tuners
Designed for tuners wanting precise control over fuel mixture and ignition timing, enabling optimal performance adjustments.
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Budget Builders
Not suitable for cost-sensitive projects due to its higher price point, which may exceed limited budgets.
Product Description
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Customer Questions & Answers
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Question:
How to Shop Holley EFI 550-931 Fuel Injection System Online From Ubuy?
Answer: It’s easy to shop Holley EFI 550-931 Fuel Injection System online from Ubuy. You just have to search for the product, choose your shipping method while checking out and get it delivered to your location. -
Question:
Is Holley EFI 550-931 Fuel Injection System Available to Shop Online in Isle of Man?
Answer: Yes, at Ubuy Isle of Man this product is available for you to shop at a reasonable price. The Holley EFI 550-931 Fuel Injection System is not available locally but you can trust us with our express shipping services. -
Question:
How Long Does It Take to Get Product After Placing the Order?
Answer: The delivery time of your ordered product varies as per what you've ordered and the shipping method that you've chosen. The estimated delivery time is mentioned during the checkout process, so be carefree while shopping.
Holley EFI Performance Fuel Injection Editorial Review
Holley EFI 550-931 Fuel Injection System is designed specifically for GM LS 4.8, 5.3, and 6.0 Truck Engines, featuring an advanced Terminator X MAX ECU which ensures easy installation and usability. This system includes a complete harness package with components such as the 58x and 4x LS Engine Main Harness, EV6 Injector Harness, and a DBW Throttle Body Harness. Users highlight its compatibility with various LS models and appreciate the included Bosch LSU 4.9 Wideband Oxygen Sensor for precise tuning. This performance-focused fuel injection system offers significant enhancements for enthusiasts looking to optimize their vehicle's performance.
Customer Reviews & Ratings
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Pros
- Designed for GM LS Truck Engines
- Includes comprehensive installation harness
- Features high-quality Bosch LSU 4.9 sensor
- User-friendly installation process
- Performance enhancement for racing applications
Cons
- Might require professional installation for optimal setup
Platform Trust & Buyer Confidence
BS
Beat
Verified buyer
“Simple process, tax and import duties announced by email. Paid online. Delivery was quick. Can recommend.”
22 October 2026 · via Trustpilot
S
Songpon
Verified buyer
“The product met my expectations perfectly. The ordering process was convenient and easy, and I was kept updated on the delivery status throughout the shipping process. The delivery was also very fast. I can confidently confirm that Ubuy provides an excellent shopping and delivery experience. Highly recommended! From Thailand”
22 October 2026 · via Trustpilot
D
Dimitra
Verified buyer
“Quick and efficient delivery and the possibility to get the package delivered from a pick-up point. I'm very happy with my experience and would recommend it again!”
22 October 2026 · via Trustpilot
HJ
Heer
Verified buyer
“My product came in good condition from the USA. I was happy that I could buy via this Chanel and that DHL brought it to my house. The communication is fine. The charger works very well. Fast and my Samsung watch and Samsung airbuds and Samsung Fold 8 Ultra all charge fast.”
22 October 2026 · via Trustpilot
SF
Sergey
Verified buyer
“Hello Ubuy team, thank you so much for the excellent service! I received the package today; it arrived in great condition and was packed very neatly. The delivery was fast, and the courier was very friendly as well. Wishing continued success to Ubuy and the entire team!”
23 October 2026 · via Trustpilot
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