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Description
Holley Sniper 550-841 EFI Stealth 4500, Shiny FinishOverview: Introducing the Sniper Stealth 4500 EFI System! Wanting to convert your Dragster or Pro street vehicle to Fuel Injection? Look no further! The Sniper Stealth 4500 EFI system from Holley features 8, 100LB HR Fuel Injectors capable of supporting 800 to 1500 HP naturally aspirated, or 800 1250 HP on forced induction applications. The Sniper Stealth 4500 also features multiple Input and Output options for sensor inputs and switched outputs to
Overview:
Introducing the Sniper Stealth 4500 EFI System! Wanting to convert your Dragster or Pro-street vehicle to Fuel Injection? Look no further! The Sniper Stealth 4500 EFI system from Holley features 8, 100LB/HR Fuel Injectors capable of supporting 800 to 1500 HP naturally aspirated, or 800-1250 HP on forced induction applications. The Sniper Stealth 4500 also features multiple Input and Output options for sensor inputs and switched outputs to control external relays. This system also comes with a USB to CAN tuning cable and free downloadable Sniper EFI Software give you unlimited control of your engine
Features:
- Supports up to 1500 HP Naturally Aspirated or 1250 HP Forced Induction with Eight 100 Lb/Hr Injectors
- Compatible with Draw through or Blow through forced induction applications
- 2.125" Throttle Plates, Flow 1440 CFM for large cubic inch engines
- 2.5Bar MAP Sensor
- Integrated ignition timing control
- Programmable launch control via 2-step and timing retard. Both can be triggered by a trans-brake input
- Gen 3 Ultra Dominator Style 4 Bolt Air Cleaner Flange
- -8AN Fuel Inlets
- High Resolution Full Color Touchscreen for Initial Setup, Tuning, and Gauge Displays
- Simple Calibration Wizard (Answer a few questions about your engine and it creates the base map, then starts tuning on its own!) - NO laptop required
- Self-tuning ECU means you don't have to be a computer/tuning wiz to have EFI!
- The included Genuine Bosch LSU 4.9 Wideband Oxygen Sensor provides realtime Fuel Map Learn
- Built-in Single Stage Wet or Dry progressive nitrous control
- Three Programmable 0-5V Sensor Inputs for Oil/Fuel/Dome or Nitrous Pressure or other critical information
- Six Programmable Ground Outputs, Five programmable ground inputs. These can be used to trigger or control external devices such as nitrous solenoids, boost control solenoids. Or to provide the ECU with an Input to turn on function such as an ignition timing
- One +5v Reference Output - +5V Power Supply for 0-5v Sensors, One Sensor Ground - Ground supply for 0-5v Sensors
- Throttle body mounted ECU - no extra boxes to mount
- Only 4 Wiring Connections Required! (Battery +, Battery - , Switched Ignition & RPM)
- Required external fuel pressure regulator, 12-848 is recommended
- Customizable secondary fuel pump output (TPS, RPM or Boost enabled)
- User friendly Boost Control with handheld adjustability
- Free Software included comprehensive datalogging tool to help you maximize the performance of your engine
- Real-time datalogging to the included 3.5" Touch Screen, allows you to save information to the SD card without needing a communication cable
- Programmable Target Air Fuel Ratios per Boost level
- Advanced boost control available via free Sniper EFI tuning software, including Boost vs RPM and Boost vs Time
- OEM Style TPS/IAC, for years of dependable service
- Included clamp-on oxygen sensor kit ensures a leak free oxygen sensor installation, with Stainless Steel T-Bolt clamps and a Stainless Steel (Weldable) oxygen sensor flange
- Patent Pending
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Application:
| Year | Make | Model | Submodel | Engine Size |
|---|---|---|---|---|
| Universal |
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Specs:
| Brand | Holley Sniper EFI |
|---|---|
| CFM | 1440 |
| Coast Guard Approved | Yes |
| Emission Code | 3 |
| Finish | Shiny |
| Flange Size | 4500 |
| Flange Style | 4500 |
| Fuel Pressure | 58.5 PSI |
| Height | 3.85" |
| Injector Size | 100 lb/hr @ 58.5 PSI |
| Inlet / Outlet Size | 8AN |
| MAP Sensor | 2.5Bar |
| Max Horsepower Rating | 1250 Forced Induction |
| Max Horsepower Rating | 1500 Naturally Aspirated |
| Product Type | Sniper EFI 4500 |
| Throttle Bore | 2.125 inch |
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
4.8 ★★★★★
Based on 16 reviews
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Product Reviews
★★★★★ 4
Takes The Edge Off!
This is a decent product. If you are going to do a lot of edging, or want to do deep trenching to run conduit, etc. this is NOT the product you want. It is electric, so you are tethered to an outlet, and of course, the farther you go on extension cords, the less of the 12 amp juice you get. It also trenches to 1 1/2", which is OK, but not enough to dump conduit, etc.
That said, this is a very good edger. Out of the box, it is minimal assembly. You connect the three pieces of the shaft, removing some edge tape from it, and inserting two metal bolts and plastic knobs, similar to most lawn mowers these days. Then you install the plastic handle with another bolt. That's it.
For use, you have a lever which you pull up for edging and lower for trenching to adjust the group clearance. You also choose 1", 1/4", or 1 1/2" depth. Then you plug it in.
There is a white line on top of the blade cover so you know where the blade is. You just pull the trigger to run the blade, or release the trigger to stop the blade.
Be careful not to lose sight of your electric cord so you don't hit it!
I edged along my driveway, about 50' on each side, as well as my front of my lawn, so another 85' along the lawn and the apron (both sides). That's over 350'. It cut through the grass and dirt easily. It struggled a couple of times, on some tough mounds of grass, but like any other tool, you don't force it when that happens, just back up and do that area again slowly.
If you come too close to blacktop, Belgian block, stone, etc. you will see sparks so you will know.
Just keep in mind, this is an edger. You will be left with the severed grass/sod to remove. In my case I was loooong overdue for a edging, so I spent a long time scraping the sod off the pavement with a shovel. I expect with more frequent ending, and now working with a cleaner edge, this will be less of an issue. Either way, that is not on the product, but the state of the lawn.
The edger has 2 read wheels and one smaller front wheel so , although this is not like a big, gas-powered curb jumping unit, you have the option of attacking a curb edge from either the blade side or other side of the edger, so you can get real close to a Belgian block curb.
I also did the edge where my grass meets my mulched flower bed, but that was more of a trimming than a edge removal.
Overall, the Work edger did as good, or better, a job than my string trimmer, and I didn't have to stop every few minutes to rewrap string. Plus it trenched enough to give me a definitive edge, whereas the string edger just cuts into the grass, not a real trench.
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Reviewed in the United States on September 28, 2020
★★★★★ 5
Easy to use for a clean looking cut!
I do wish there was a cordless version but I'm so glad I bought this. It took some time to edge everything the first time because I had to cut the lines but it's been a breeze ever since. I just walk the perimeter of the yard and driveway and it does it's job with ease.
The front wheel has three settings which determines how far down the blade cuts and the blade has two settings for edging or trenching. The handle is stationary but it can be lifted up or down. There's a guideline on top of the blade guard that helps identify where the blade is going to make the cut. TIP: Lean it back on the back wheels before pulling the trigger and slowly bring it down because it will jump if the blade isn't lined up and touches the concrete.
It doesn't roll well in the grass but it's very smooth when rolled on the concrete. It's definitely worth having to give a clean and finished look. It's well built and isn't too heavy but definitely has some weight to it. It's only loud when the blade hits the concrete otherwise it sounds like a drone. The only complaint I have is that I have to watch the cord closely other than that it's the perfect tool to give a clean look to the yard.
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Reviewed in the United States on August 5, 2025
★★★★★ 5
Great product for the $$$$
This edger is awesome. Easy to put together. Intuitive. I put it together inside of 10 minutes. Shifted the edger "guide" down, and went to work. This corded electric model is WAYYY cheaper than the battery powered (or gas powered) models, and is absolutely up to the task. Lightweight and maneuverable. Quiet. Easy to store. The motor got a little "bound" when I tried to edge too fast, but the manual had clearly warned me on this - to back up, let the blade get back up to speed, and then edge again. The lawn edges are now straight, well-defined, and immaculate.
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Reviewed in the United States on April 2, 2026
★★★★★ 5
Great edger
This was a gift for someone very picky about their yard. They loved it and said it works great.
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Reviewed in the United States on May 9, 2026
★★★★★ 3
Great but could be Epic
If you’re looking for a solid edger for sidewalks and driveways, this is a great tool. It’s powerful, well-built, easy to assemble, and simple to use. For edging, I would definitely recommend it.
However, I wouldn’t recommend it as a true trencher. I bought it for both purposes but mainly needed it for trenching. The maximum cutting depth is only about 1.5 inches, which isn’t deep enough for most garden borders or running cable. In my opinion, a real trencher should be able to reach at least 3 inches deep.
The limitation comes down to the blade size and guard design. WORX could improve this model with a larger blade guard and additional wheel depth settings. If they released a version capable of 3–3.25 inch trenching depth, it would really stand out in the market.
Overall, it’s an excellent edger, just not a true trencher.
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Reviewed in the United States on May 25, 2026
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