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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
Application:
| Year | Make | Model | Submodel | Engine Size |
|---|---|---|---|---|
| Universal |
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
4.6 ★★★★★
Based on 14 reviews
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Product Reviews
★★★★★ 4
Almost Perfect
If you’ve ever seen these things, the foldable ones are just as good as the standard ones. I just wish when you folded it up there was a way to lock it into that position. When you unfold it to play, you lock it into place with the orange locking slide so it doesn’t fold up on you. But when you’re done playing and fold it up, there’s no way to lock it into that position, it can keep unfolding if you carry it around with you, plus the orange locking slide keeps sliding up and down. It’s not a huge deal, but they could’ve made it better.
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Reviewed in the United States on April 29, 2026
★★★★★ 5
Helpful
I’ve used Chuckit ball launchers, this one is foldable, great for my back pack when camping with my dog
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on February 27, 2026
★★★★★ 5
Great quality and folding it in half is a plus. Fits under a seat in car/truck.
Purchased another, as we need one in each car. This is a great ball thrower, especially as it folds in a half. Makes it easy to store under a car/truck seat. Haven’t had any problem with it, great quality!
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on May 4, 2026
★★★★★ 5
Fantastic throwing aid!
Very well made, great quality and doesn't feel cheap at all. It's thick, not flimsy or fragile so you can really swing it to launch a ball. Saves my body that I don't have to bend over to pick up the ball anymore, and saves my shoulder that I don't have to hurl the ball anymore. Another bonus is you don't have to touch a slobbered, soggy ball, or a ball covered in dirt.
The foldable design is fantastic because I walk everywhere with my dog and don't want to carry around a long stick that's awkward to hold. This folds down small enough that I can securely put it in the back pocket of my jeans without worrying about it falling out. The thing I love most about it is there's a elastic loop at the end so when you fold it you can latch it securely. This small detail is outstanding because I can also hang it on the strap of my sling bag and with the loop secured it will not slip off the strap.
This product is so well made and thought out overall.
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Reviewed in the United States on February 14, 2024
★★★★★ 5
Excellent toy for play
My dog would play all day if I threw the ball to him. He loves this even though he's 12. The scooped end allows you to pick up the ball without touching it. After a few runs it's covered in dog slobber. So that's a major plus for me! Also, some health issues affect my walking and bending at times. This helps with the bending. This is a great game to play with your favorite friend!
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on May 5, 2026
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