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Holley Sniper EFI 550-877 Supports Up To 1250HP Boosted - 3.5 in. Handheld Monitor - Carburetor Styling
Vendor:
Holley Sniper EFI
SKU:
FRCQ_550-877
Availability:
Out of stock. Chat\Call to Order
Product Type:
Fuel Injection Conversion Kit
- Regular price
- $2,448.00 USD
- Regular price
-
$1,721.00 - Sale price
- $2,448.00 USD
- Unit price
- per
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Description
xIf you're looking to make some big power, the Super Sniper Stealth is made for you! Holley's Sniper EFI Super Sniper Stealth 1250 is the best way to convert your carbureted engine to fuel injection with just 4 simple connections required. Super Sniper can support up to 1250HP boosted with 8 100 LB/HR Injectors. With a Stealth 1250 system, you get that carburetor styling but the functionality of a Sniper! This 4-barrel system features a single pattern bolt on design built to fit 4150 flange manifolds. The Super Sniper Stealth ECU is capable of fuel map self-learning and ignition timing control, improving idle stability, drivability, and wide-open throttle horsepower. Additionally, this Sniper kit also includes transmission kick down provisions for GM TH350/400, 200R4/700R4, and Ford C4/C6 applications!
Specifications:
| 10429 | No |
| 10431 | No |
| Brand | Holley Sniper EFI |
| 10423 | No |
| Category | Air and Fuel Delivery |
| CFM | 870 |
| 10438 | No |
| 10430 | Yes |
| 10437 | No |
| 10442 | Yes |
| 10418 | No |
| 10428 | No |
| Emission Code | 3 |
| Finish | Black |
| Flange Style | 4150 |
| 10433 | Yes |
| 7246 | No |
| 10417 | No |
| 906 | Yes |
| Fuel Pressure | 58.5 PSI |
| 10425 | No |
| 8922 | No |
| 3390 | Performance |
| Height | 3.28" |
| 10422 | Yes |
| 10432 | No |
| Injector Size | 100 lb/hr @ 58.5 PSI |
| Inlet / Outlet Size | 3/4-16 Female O-Ring (AN 8) |
| 9780 | No |
| 10427 | No |
| MAP Sensor | 2 Bar |
| Max Horsepower Rating | 650 Naturally Aspirated |
| Max Horsepower Rating | 1250 Forced Induction |
| Model | 4150 EFI Conversion Throttle Body |
| 10420 | Yes |
| part type | Fuel Injection Conversion Kit |
| Product Type | Super Sniper Stealth 4150 - 1250 HP |
| 10421 | Yes |
| 10434 | Yes |
| Sub Category | Service Kits |
| 918 | Yes |
| 10426 | No |
| Transmission | 700R4/200R4, Ford C4/C6, TH350 |
| 10435 | Yes |
| Warning | California Proposition 65 |
| 10419 | Yes |
| 10429 | No |
| 10431 | No |
| Brand | Holley Sniper EFI |
| 10423 | No |
| Category | Air and Fuel Delivery |
| CFM | 870 |
| 10438 | No |
| 10430 | Yes |
| 10437 | No |
| 10442 | Yes |
| 10418 | No |
| 10428 | No |
| Emission Code | 3 |
| Finish | Black |
| Flange Style | 4150 |
| 10433 | Yes |
| 7246 | No |
| 10417 | No |
| 906 | Yes |
| Fuel Pressure | 58.5 PSI |
| 10425 | No |
| 8922 | No |
| 3390 | Performance |
| Height | 3.28" |
| 10422 | Yes |
| 10432 | No |
| Injector Size | 100 lb/hr @ 58.5 PSI |
| Inlet / Outlet Size | 3/4-16 Female O-Ring (AN 8) |
| 9780 | No |
| 10427 | No |
| MAP Sensor | 2 Bar |
| Max Horsepower Rating | 650 Naturally Aspirated |
| Max Horsepower Rating | 1250 Forced Induction |
| Model | 4150 EFI Conversion Throttle Body |
| 10420 | Yes |
| part type | Fuel Injection Conversion Kit |
| Product Type | Super Sniper Stealth 4150 - 1250 HP |
| 10421 | Yes |
| 10434 | Yes |
| Sub Category | Service Kits |
| 918 | Yes |
| 10426 | No |
| Transmission | 700R4/200R4, Ford C4/C6, TH350 |
| 10435 | Yes |
| Warning | California Proposition 65 |
| 10419 | Yes |
| Description_ABR | Super |
| Description_SHO | Super Sniper Stealth |
| Description_INV | SUPER SNIPER STEALTH 4150 8-INJ, BLACK |
| Description_ASC | Part # 534-247 is required to complete installation. |
| Description_DES | Holley Sniper EFI Super Sniper Stealth 1250 - Black |
| Description_EXT | Supports Up To 1250HP Boosted - 3.5 in. Handheld Monitor - Carburetor Styling |
| Description_MKT | Sniper EFI is part of a complete ecosystem! Your new Sniper kit pair's seamlessly together with Holley's Sniper Hyperspark Ignition, Fuel System's, Air Cleaners, Throttle Body & Digital Dash to unlock the full potential of your build. Complete your fuel injection journey by checking out our full offer of ignition, fueling and accessories! |
| Description_MKT | We want everything to be as simple as it can be for you! Sniper kits are built and designed to be installed at home in your garage or driveway with limited tools and the support of Holley's comprehensive installation manual and videos. An afternoon in the garage and you will be enjoying improved engine performance, better MPG's and easier starting. After the simple installation it's time to let your Sniper begin the self-tuning process. Our user-friendly calibration wizard allows you to just answer a few questions about your engine and the system will begin self-tuning with no laptop required. You don't have to be a computer wiz or specialize in tuning to use a Sniper EFI system! Use the high resolution 3.5" full color touchscreen for tuning and gauge displays. |
| Description_MKT | If you're looking to make some big power, the Super Sniper Stealth is made for you! Holley's Sniper EFI Super Sniper Stealth 1250 is the best way to convert your carbureted engine to fuel injection with just 4 simple connections required. Super Sniper can support up to 1250HP boosted with 8 100 LB/HR Injectors. With a Stealth 1250 system, you get that carburetor styling but the functionality of a Sniper! This 4-barrel system features a single pattern bolt on design built to fit 4150 flange manifolds. The Super Sniper Stealth ECU is capable of fuel map self-learning and ignition timing control, improving idle stability, drivability, and wide-open throttle horsepower. Additionally, this Sniper kit also includes transmission kick down provisions for GM TH350/400, 200R4/700R4, and Ford C4/C6 applications! |
| Description_FAB | The included Genuine Bosch LSU 4.9 Wideband Oxygen Sensor provides real-time Fuel Map Learn! |
| Description_FAB | Included clamp-on oxygen sensor kit for 2.25" exhaust ensures a leak free oxygen sensor installation, with Stainless Steel T-Bolt clamps and a Stainless Steel (Weldable) oxygen sensor flange |
| Description_FAB | Air entry is machined to fit most stock style air cleaners with air cleaner locator provisions. |
| Description_FAB | OEM Style TPS/IAC, for years of dependable service. |
| Description_FAB | Six Programmable Ground Outputs |
| Description_FAB | Bolt on 4150 Flange Carburetor Replacement |
| Description_FAB | Throttle body mounted ECU – no extra boxes to mount |
| Description_FAB | External fuel pressure regulator required, set to a base pressure of 58.5 PSI, such as 12-886. |
| Description_FAB | One Sensor Ground – Ground supply for 0-5v Sensors |
| Description_FAB | Programmable inputs and outputs |
| Description_FAB | Integrated ignition timing control |
| Description_FAB | Timed spark part for vacuum advanced distributors located under the front fuel bowl, for easy access to the distributor. |
| Description_FAB | Self-tuning ECU means you don’t have to be a computer/tuning wiz to have EFI! |
| Description_FAB | Available in 3 finishes: Shiny, Black and coming soon, Gold |
| Description_FAB | Three Programmable 0-5V Sensor Inputs for Oil/Fuel/Dome or Nitrous Pressure Sensors |
| Description_FAB | Supports up to 1250hp with Eight 100 Lb/Hr Injectors! |
| Description_FAB | One +5v Reference Output - +5V Power Supply for 0-5v Sensors |
| Description_FAB | All of the wiring exits below the rear fuel injector cover, for a completely stealth installation. |
| Description_ABR | Super |
| Description_SHO | Super Sniper Stealth |
| Description_INV | SUPER SNIPER STEALTH 4150 8-INJ, BLACK |
| Description_ASC | Part # 534-247 is required to complete installation. |
| Description_DES | Holley Sniper EFI Super Sniper Stealth 1250 - Black |
| Description_EXT | Supports Up To 1250HP Boosted - 3.5 in. Handheld Monitor - Carburetor Styling |
| Description_MKT | Sniper EFI is part of a complete ecosystem! Your new Sniper kit pair's seamlessly together with Holley's Sniper Hyperspark Ignition, Fuel System's, Air Cleaners, Throttle Body & Digital Dash to unlock the full potential of your build. Complete your fuel injection journey by checking out our full offer of ignition, fueling and accessories! |
| Description_MKT | We want everything to be as simple as it can be for you! Sniper kits are built and designed to be installed at home in your garage or driveway with limited tools and the support of Holley's comprehensive installation manual and videos. An afternoon in the garage and you will be enjoying improved engine performance, better MPG's and easier starting. After the simple installation it's time to let your Sniper begin the self-tuning process. Our user-friendly calibration wizard allows you to just answer a few questions about your engine and the system will begin self-tuning with no laptop required. You don't have to be a computer wiz or specialize in tuning to use a Sniper EFI system! Use the high resolution 3.5" full color touchscreen for tuning and gauge displays. |
| Description_MKT | If you're looking to make some big power, the Super Sniper Stealth is made for you! Holley's Sniper EFI Super Sniper Stealth 1250 is the best way to convert your carbureted engine to fuel injection with just 4 simple connections required. Super Sniper can support up to 1250HP boosted with 8 100 LB/HR Injectors. With a Stealth 1250 system, you get that carburetor styling but the functionality of a Sniper! This 4-barrel system features a single pattern bolt on design built to fit 4150 flange manifolds. The Super Sniper Stealth ECU is capable of fuel map self-learning and ignition timing control, improving idle stability, drivability, and wide-open throttle horsepower. Additionally, this Sniper kit also includes transmission kick down provisions for GM TH350/400, 200R4/700R4, and Ford C4/C6 applications! |
| Description_FAB | The included Genuine Bosch LSU 4.9 Wideband Oxygen Sensor provides real-time Fuel Map Learn! |
| Description_FAB | Included clamp-on oxygen sensor kit for 2.25" exhaust ensures a leak free oxygen sensor installation, with Stainless Steel T-Bolt clamps and a Stainless Steel (Weldable) oxygen sensor flange |
| Description_FAB | Air entry is machined to fit most stock style air cleaners with air cleaner locator provisions. |
| Description_FAB | OEM Style TPS/IAC, for years of dependable service. |
| Description_FAB | Six Programmable Ground Outputs |
| Description_FAB | Bolt on 4150 Flange Carburetor Replacement |
| Description_FAB | Throttle body mounted ECU – no extra boxes to mount |
| Description_FAB | External fuel pressure regulator required, set to a base pressure of 58.5 PSI, such as 12-886. |
| Description_FAB | One Sensor Ground – Ground supply for 0-5v Sensors |
| Description_FAB | Programmable inputs and outputs |
| Description_FAB | Integrated ignition timing control |
| Description_FAB | Timed spark part for vacuum advanced distributors located under the front fuel bowl, for easy access to the distributor. |
| Description_FAB | Self-tuning ECU means you don’t have to be a computer/tuning wiz to have EFI! |
| Description_FAB | Available in 3 finishes: Shiny, Black and coming soon, Gold |
| Description_FAB | Three Programmable 0-5V Sensor Inputs for Oil/Fuel/Dome or Nitrous Pressure Sensors |
| Description_FAB | Supports up to 1250hp with Eight 100 Lb/Hr Injectors! |
| Description_FAB | One +5v Reference Output - +5V Power Supply for 0-5v Sensors |
| Description_FAB | All of the wiring exits below the rear fuel injector cover, for a completely stealth installation. |
Vehicle Fitment
xShipping
xSHIPPING & DELIVERY INFORMATION
Free Shipping
- Eligibility: Orders over $99 in the USA & Canada.
- Exceptions: Oversized or heavy items may incur extra fees (we’ll notify you before shipping).
- Non-Eligible Areas: Vancouver Island, Yukon, NWT, Nunavut, Alaska, Hawaii, Puerto Rico & other U.S. territories.
Fast Shipping
- Processing: Orders placed before 2 PM usually ship the same day.
- Delivery Time: 2–5 business days via Purolator, FedEx, or Loomis Express.
- Note: Delivery may take longer for distant warehouses or inter-warehouse transfers.
Shipping Limitations
- No P.O. Boxes: Please provide a physical address.
- Remote Areas: Free shipping excludes remote regions.
Special Orders & Backorders
- May incur additional handling fees (discussed before shipping).
- You may cancel if costs are too high for a full refund.
Warranty
- For internal damage or missing parts, contact the manufacturer directly for faster service.
- After 30 days, contact the manufacturer first — if unresolved, our team will assist.
Oversized Items
- Shipped via LTL Freight (items over 150 lbs or large dimensions).
- We’ll confirm any added costs before shipping.
- Examples: Large Fridges, Oversize Toolbox or Tanks, Drop in Bed liners, Wheel to Wheel Step bar & Running Boards, Large Roof Cargo Box, Heavy Bumpers, RV Doors, Oversize, Roof Tent, Large gas tank, Oversize Grille Guards, Fifth Wheel Hitch, Sofa , Trailer Axle.
- Special Handling Fees: Items like batteries may incur additional shipping fees.
Returns & Cancellations
In-Stock Items
- Cancel before shipment; once shipped, standard return policy applies.
- 20% restocking fee, excluding oversize item. Both way shipping is customer responsibility under store error.
Backorders / Special Orders
- 5% restocking fee applies if canceled within 30 days.
- Non-cancellable once shipped from the manufacturer.
- Refused Deliveries: Refund minus shipping & restocking fees (excludes special orders).
- Payment Disputes: Chargebacks do not cancel orders — please contact us directly.
Core Fees
- Not included in the purchase price.
- Refundable upon return of the old part in usable condition.
If you have any questions or need assistance, please reach out to us at 800.292.4173 or support@mytruckpoint.ca.
Why Us
xWhy Choose MyTruckPoint?
When it comes to your truck, compromise is not an option. At MyTruckPoint, we deliver the quality, speed, and trust that professionals across Canada depend on every day.
🇨🇦 Trusted Across Canada for 10+ Years
A decade of proven reliability serving truck owners, fleets, and businesses nationwide. We’ve built our reputation by delivering consistent quality and dependable service.
📦 100,000+ Orders Delivered
Over one hundred thousand successful orders — every one backed by accuracy, speed, and customer satisfaction you can count on.
✅ Authorized Dealer of Leading Brands
No knock-offs. No compromises. Only genuine parts from top-tier brands, ensuring performance, safety, and long-term value.
💪 Built for Performance & Durability
Our parts are selected to handle real-world demands — tough jobs, long hauls, and harsh conditions. Because your truck deserves the best.
💰 Competitive Pricing Without Cutting Corners
Premium quality doesn’t have to mean premium prices. We deliver exceptional value so you get more for every dollar spent.
⚡ Fast, Reliable Shipping
Downtime costs money. That’s why we process orders quickly and deliver efficiently — so you can get back on the road faster.
🧠 Expert Support You Can Rely On
Not sure what you need? Our experienced team is here to guide you with honest advice and the right solutions — every time.
🤝 Customer-First Commitment
We stand behind every order. Your satisfaction isn’t optional — it’s our priority.
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