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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 1372 reviews
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Product Reviews
★★★★★ 5
Dermatologist-Recommended, Gentle Coverage with Added Sun Protection
Size: 1.7 Fl Oz (Pack of 1), Size: 1.7 Fl Oz (Pack of 1)
This Eucerin Tinted Moisturizer was recommended to me by my dermatologist after having MOHS surgery performed on my face twice. At that point, sun protection became non-negotiable. He felt that the moisturizer with SPF 30 that was already part of my skincare routine was not sufficient on its own and suggested adding this product for better daily protection.
I’m so glad I followed his advice. This tinted moisturizer provides lightweight, natural-looking coverage that evens out my skin tone without feeling heavy or settling into fine lines. It blends easily and leaves my skin looking healthy and polished, not made-up.
What I appreciate most is how hydrating and gentle it is. My skin can be sensitive, especially after procedures, and this has caused no irritation or breakouts. It wears comfortably all day and layers well with other skincare products when needed.
The coverage is sheer, so it won’t replace foundation if you want full coverage, but it’s perfect for everyday wear and gives me the confidence to step out with minimal makeup while knowing my skin is protected.
I would highly recommend this to anyone who has sensitive skin, a history of skin cancer or procedures, or who simply wants reliable sun protection with a natural finish.
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Reviewed in the United States on January 24, 2026
★★★★★ 5
The Lazy Makeup Day MVP
Size: 1.7 Fl Oz (Pack of 1)
This has become my easy low-maintenance face day product. It gives just enough tint to even things out while still giving solid SPF coverage, so I can skip foundation without feeling totally bare-faced. The finish feels lightweight, my skin stays comfortable all day, and the color blended into my skin way better than I expected from a “universal” tint.
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Reviewed in the United States on May 6, 2026
★★★★★ 4
Overall good aesthetic result for mineral sunscreen, but some downsides
Size: 1.7 Fl Oz (Pack of 1)
It is quite good overall, it blends in perfectly to my medium-light warm tone skin. There is no white tint. It seems effective in terms of SFP and doesn't leave a greasy or heavy feel, ends up looking lightly glowy but reasonably dry to the touch. I'm not sure you'd want to apply it thick enough to substitute for foundation.
What I don't like
- Like makeup the color can rub off on clothes etc.
- Doesn't seem to reapply very well, leads to pilling, and also rubbing my face at all leads to pilling. It's very "don't touch it again after you applied once"
- Quite hard to remove with normal cleanser, I think I might need to remove it with oil or something?
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Reviewed in the United States on January 29, 2026
★★★★★ 3
Way too heavy & greasy for combination skin
Size: 1.7 Fl Oz (Pack of 1)
Ugh this tinted sunscreen is such a let-down. I was excited to find an option that's a mineral sunscreen, with tinting that's supposed to work for all skin tones, is made with non-comedogenic ingredients, and is a more reasonable price than what my old tinted sunscreen now costs. I saw mixed reviews on the greasiness / heaviness of this sunscreen, but decided to give it a try, especially because I have combo skin that gets pretty dry in the winter... but wish I had listened to the people who said this is overwhelmingly thick.
Pros: the tint works fairly well for my light-to-medium warm-toned skin (although you can see in my video it doesn't blend at all well with my hand's skin tone... so can't imagine this will be universal), it doesn't irritate my combination skin that can be very sensitive, and hasn't blocked my pores.
Cons: This feels like I'm smearing peanut butter on my face - it is such a thick and oily consistency. I have combination skin, with some areas that are especially dry right now in a northern winter climate... but this is not what I would call "moisturizing" - it's greasiness that is impossible to rub in, doesn’t dry down, and instead just sits on the skin (and I'm not even using close to the amount of sunscreen you're supposed to in order to get the true SPF coverage). I use tinted sunscreen to replace the need for a BB cream or foundation, and this unfortunately would never be appropriate for everyday wear.
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Reviewed in the United States on February 27, 2026
★★★★★ 5
Not super greasy, thankfully!
Size: 1.7 Fl Oz (Pack of 1)
Very gopd product! Goes on smooth and protects well. Non greasy feel.
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Reviewed in the United States on May 20, 2026