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Description
Dominator EFI-LS1 Main Harness w/ Trans Control w/EV1 Injector Harness 550-656Fits GM LS 24x Crank, 1x Cam LS1 LS6 style Engines with EV1 Injectors, and a 4L60 80E Transmission Features: Dominator EFI base kits come in several product variations to fit most popular domestic V8 engine applications such as; LS, SBC BBC, SBF, BBF, and Chrysler engines1 Kits include the following: Dominator ECU, USB cable, ECU Power Harness, Engine Main Harness, EV1 Injector Harness, Bosch Wideband, ECU mounting hardware2 Integrated electronic
Fits GM LS 24x Crank, 1x Cam - LS1/LS6 style Engines with EV1 Injectors, and a 4L60/80E Transmission
Features:
- Dominator EFI base kits come in several product variations to fit most popular domestic V8 engine applications such as; LS, SBC/BBC, SBF, BBF, and Chrysler engines1
- Kits include the following: Dominator ECU, USB cable, ECU Power Harness, Engine Main Harness, EV1 Injector Harness, Bosch Wideband, ECU mounting hardware2
- Integrated electronic transmission control - Operates GM 4L60E and 4L80E transmissions, Ford AODE and 4R70W with more to come in the future3
- Integrated drive by wire throttle body control - Can control two drive by wire throttle bodies. Compatible with a number of DBW throttle bodies including GM, Chrysler, Ford, and Nissan4
- Integrated dual channel wide band oxygen sensor controls ? For monitoring both engine banks (NTK or Bosch sensors)5
- Extensive amount of inputs and outputs allow for limitless combination of options. Allows for unit to be used as a complete data acquisition system as well6
- Individual cylinder fuel and spark control allows you to unlock your engine?s potential7
- 1-7 Bar MAP sensor capability ? For naturally aspirated or boosted applications8
- Fuel Map and Learn Function Smoothing ? Helps to smooth rough areas of the maps9
- Self-tuning fuel table strategy greatly simplifies tuning process ? The more you drive it, the more it learns10
- ?Quick Start? strategies ? For faster engine starting11
- Allows for use of common OEM sensors as well as custom sensor calibration input12
- Two channel knock control sensor inputs for both one or two wire knock sensors13
- Store and select between four calibrations with Multi Map Selector (Part Number 558-407)14
- HARDWARE15
- ECU is fully potted and can be mounted in the engine compartment or interior ? See images for dimensions16
- Sealed automotive and marine grade connectors17
- Optional Digital Displays - 7" Digital Dash (PN 553-106) / 3.5" Touch Screen LCD (PN 553-108)18
- 12.3" Pro Dash (PN 553-111) and 7" Race Dash (PN 553-106) features full gauge layout customization, and nearly limitless tuning options.19
- DATA VISUALIZATION TOOLS20
- Data Logger ?Analyze and export your data with sophisticated, but user friendly tools ? Internal logger has 4 GB of memory21
- Strip Chart ? For real-time data viewing22
- Fully Configurable lap top Gauge Panel ? Life-like gauge cluster on your laptop screen23
- Racepak Integration Module Available.24
- Data logger - Smoothing, multiple graph view, pre-defined notes fields and more..25
- 8 STAGE NITROUS OXIDE CONTROL26
- Fully featured nitrous control eliminates the need for a separate nitrous controller device27
- Can be configured ?Wet? or ?Dry? with closed loop feedback28
- Progressive control based on time, RPM, or boost, requires part # 554-11129
- Lean or rich safety cutoff30
- Full timing retard/control configurability per stage based on RPM or time31
- INTEGRATED WATER/METHANOL INJECTION CONTROL32
- Uses Holley water/meth solenoids specially designed and calibrated for use with this EFI system to allow the user to enter water/meth flow as a percentage of fuel injector flow for water/meth tuning precision unmatched in the industry33
- Allows for two nozzles to be controlled34
- Nozzles available from 400 to 1000 cc/min35
- Complete control of pump activation, and low system safety features36
- TURBOCHARGER BOOST CONTROL37
- Fully featured boost control capability eliminates the need for a separate boost control device38
- Can be configured to control boost based on time, gear, speed, and manual inputs39
- Gear based boost control configurable by several different methods40
- ?Boost Builder? functions offer the ability to assist building boost on the starting line by altering ignition timing, fueling, as well as nitrous oxide activation. Can also be used as an anti-lag function41
Specs:
| Accelerometer Support | Yes |
|---|---|
| Boost Control | Yes |
| Brand | Holley EFI |
| CAN-BUS Support | Yes |
| Category Filter | Fuel Injection - EFI |
| Clearance Category | Fuel Injection - EFI |
| Coast Guard Approved | Yes |
| Coil Per Cylinder Ignition Support | Yes |
| Datalogging Support | Yes |
| Dry Nitrous Control | Yes |
| e85 Support | Yes |
| EGT Support | Yes |
| Emission Code | 3 |
| Engine | GM LS1/LS2/LS6 |
| Forced Induction Support | Yes |
| Fuel Filter Included | No |
| Fuel Hose Included | No |
| Fuel Injectors Included | No |
| Fuel Pressure Regulator Included | No |
| Fuel Pump Included | No |
| Grade Type | Performance |
| Height | variable 1.00" to 1.84" |
| Ignition Timing Control | Yes |
| Individual Cylinder Fuel Corrections | Yes |
| Intake Manifold Included | No |
| Knock Retard Support | Yes |
| Length | 13.14" overall |
| Mounting Bolt Pattern | 12.13"x 6.10" |
| Multi-Stage Nitrous Control | Yes |
| Product Type | Dominator ECU - ECM - VCM |
| Progressive Nitrous Control | Yes |
| Self-Tuning | Yes |
| Throttle Position Sensor Included | No |
| Traction Control Support | Yes |
| User-Tuneable | Yes |
| Warning | California Proposition 65 |
| Wet Nitrous Control | Yes |
| Width | 6.10" overall |
Application:
| Year | Make | Model | Submodel |
|---|---|---|---|
Shipping Notes
- Free Standard Shipping on $100+ Orders to the USA.
- Except Preorder products are shipped in 48 hours.
- Delivery to the USA:
- Standard Shipping : 3-10 business days
- If time is of the essence, please consider selecting expedited delivery for faster service.
Exchange/Return Notes
- We offer a 30-day return/exchange service after receiving.
- Final sale items are not eligible for returns or exchanges.
- To process your return/exchange, please contact us at [email protected]
- Please click here for more details>>> Return & Exchange Policy
4.7 ★★★★★
Based on 14 reviews
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Product Reviews
★★★★★ 5
Very gentle toner!
I’m so glad I found this. With my rosacea I have to be careful what I use on my face. This toner is very gentle and doesn’t hurt my face. Will keep ordering it.
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Reviewed in the United States on July 13, 2025
★★★★★ 5
My Go-To Toner After Trying Many Others
Scent: Unscented, Size: 12 Fl Oz (Pack of 1)
I’ve tried many toners over the years, including higher-end brands, and this one continues to stand out for both performance and price. It does exactly what I need without unnecessary extras.
The formula feels gentle and effective, and I really appreciate that it’s alcohol free and fragrance free. Those two things are especially important to me, and this has been the only toner I’ve felt comfortable using during pregnancy. It doesn’t irritate my skin and fits easily into my daily routine.
Despite the affordable price, it performs just as well—if not better—than many more expensive options I’ve used in the past. My skin feels clean and refreshed after using it, without any tightness or residue.
Overall, this is a reliable, no-nonsense toner that delivers great results at a very reasonable price. If you’re looking for a simple, fragrance-free option that works well without breaking the bank, this is an easy recommendation.
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Reviewed in the United States on January 9, 2026
★★★★★ 5
Liquid facial magic!
Scent: Coconut Water, Size: 12 Fl Oz (Pack of 1)
I love this stuff. I use it daily as part of my facial routine and it has become one of those products I don’t even think about anymore because it just works.
It smells good without being overpowering and does a great job of helping control excessive oil buildup on my face. Nothing harsh, nothing drying, just clean and refreshed skin. Right after using this, I follow up with a facial moisturizer and the combo works beautifully. My skin feels balanced instead of tight or angry, which is exactly what I’m going for.
I know the label says men can use this as an aftershave, but that’s a hard pass for me. I stick to soothing, purpose-built post-shave products, specifically from Wholly Kaw. That stuff smells like it was handcrafted by skincare deities who truly care about your face. This toner is staying firmly in the “daily skincare” lane, where it shines.
Another big plus is how gentle it is. No burning, no weird tingling, no regret. Just a calm, refreshing step that makes my skin feel like it’s being treated with respect.
And the price? Under $10. That alone keeps me coming back. Honestly, I think they could charge a few dollars more for how well this performs, but I won’t complain about paying less for fantastic facial liquid magic.
Simple, effective, affordable, and a permanent part of my routine. My face approves.
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Reviewed in the United States on December 21, 2025
★★★★★ 5
THAYERS Lavender Witch Hazel Toner: Time-Tested Elegance in a Bottle!
Scent: Lavender, Size: 12 Fl Oz (Pack of 1)
Embarking on a journey down memory lane with THAYERS Lavender Witch Hazel Facial Toner has been nothing short of a delightful reunion. This timeless brand, known since my youth, has proven its mettle yet again. Let's dive into the aromatic, moisturizing wonder that is the Lavender Witch Hazel Toner:
Quality Infused with Elegance (5/5): THAYERS brings a touch of timeless elegance to skincare, and this lavender-infused toner is no exception. The quality is unmistakable, leaving my skin feeling pampered and rejuvenated after each use.
Cleansliness at its Best (5/5): The toner's prowess in cleansing is unparalleled. It effortlessly removes dirt and impurities, unveiling a refreshed and squeaky-clean complexion. My skin thanks me for this daily ritual of cleanliness.
Moisturizing Magic (5/5): The moisturizing effect is like a gentle caress for the skin. Unlike some toners that leave your face feeling parched, THAYERS Lavender Toner ensures that my skin is not just clean but incredibly moisturized after every application.
Refreshing Elixir (5/5): Ah, the refreshing burst of lavender! While opinions on the strength of the scent may vary, I find the lavender notes to be a delightful touch. The toner rejuvenates not just my skin but also my senses, making each application a mini spa moment.
Better than the Expensive Competitors (5/5): Sometimes the best things come in unassuming packages. Users have attested that this toner outshines even pricier competitors, proving that quality doesn't always have to break the bank.
Mixed Durability Verdict (4/5): Opinions are divided on durability, but for me, the overall benefits outweigh any minor considerations. The toner's efficacy in daily use makes it a staple in my skincare routine.
Generations-Long Trust (5/5): THAYERS is a brand that has stood the test of time, transcending generations. Its legacy of trustworthiness extends beyond my own experience, connecting with others who have relied on its skincare wonders.
Lavender Scent Aspiration (4/5): While I had hoped for a stronger lavender scent, the subtle notes are still a pleasant addition to my skincare ritual. The product's efficacy compensates for any scent expectations.
In conclusion, THAYERS Lavender Witch Hazel Facial Toner is a testament to the enduring charm of a trusted brand. Its quality, cleanliness, and moisturizing benefits make it a staple in my skincare routine and a connection to the past. Whether you're a longtime fan or a newcomer, this toner is a timeless treasure for your skin. Cheers to THAYERS for continuing to deliver skincare excellence!
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Reviewed in the United States on February 17, 2024
★★★★★ 5
Lasts awhile! Good product
Scent: Rose Petal, Size: 12 Fl Oz (Pack of 1)
Cleans without overdrying. Leave skin feeling clean, no stickiness. Pleasant light scent that doesn't linger. I get my moister from other products so this one idk if it moisturizes by itself. Good value for the money, you get a lot so it lasts awhile.
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Reviewed in the United States on May 10, 2026