Skip to content

Holley EFI 550-843 Sniper EFI Stealth 4500 Throttle Body System

SKU ds_BBVL_550-843
Proudly Canadian

Albertan Owned

Supporting Canadian truckers since 2018
Secure Payments

Financing Available

SSL encrypted checkout with financing options
Trusted Brands

Top-Quality Suppliers

Authorized dealer for Fox, Bilstein, BFGoodrich & 50+ brands
Sold out
Original price $3,014.84 - Original price $3,014.84
Original price $3,014.84
$3,104.65
$3,104.65 - $3,104.65
Current price $3,104.65
Availability:
Out of stock
Description
The Sniper Stealth 4500 EFI system 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 features multiple Input/Output options for sensor inputs and switched outputs to control external relays. This system comes with a USB to CAN tuning cable and free downloadable Sniper EFI Software give you unlimited control of your engine. * 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.
Resources
Installation Instructions
Resources
Installation Instructions

Specifications

CFM 1440
Description_ASC Holley Performance Emission Code 3: This part is legal for sale and use on Uncontrolled (Non-Emissions Controlled) Vehicles and Racing Use Only Vehicles. The following vehicles are considered Uncontrolled (Non-Emissions Controlled) Vehicles: 1965 and older U.S. manufactured California Certified vehicles/1967 and older U.S. manufactured Federally Certified vehicles/1967 and older Foreign manufactured vehicle. The following vehicles are considered Racing Use Only Vehicles: Racing Use Only Vehicles are vehicles that are used exclusively for competition and that are not registered and that may never be used on the street. WARNING: It is against the law to install this part on an Emissions Controlled Vehicle. The following vehicles are considered Emissions Controlled Vehicles: 1966 and newer U.S. manufactured California Certified vehicles/1968 and newer U.S. manufactured Federally Certified vehicles/1968 and newer Foreign manufactured vehicle
Description_DEF Fuel Injection Throttle Body
Description_DES Sniper EFI Stealth 4500 Throttle Body System
Description_EXT Sniper EFI Stealth 4500 Throttle Body System; 800-1500HP; 8 Injector; Incl. O2 and Coolant Temp Sensor/Gaskets/3.5 in. Touch Screen Controller/Harness/Hardware; Gold Finish;
Description_FAB -8AN Fuel Inlets
Description_FAB 2.125 Throttle Plate; Flow 1440 CFM
Description_FAB Bosch LSU 4.9 Wideband O2 Sensor Provides Realtime Fuel Map Learn
Description_FAB Compatible w/Draw or Blow Through Forced Induction Apps.
Description_FAB Eight 100 lb../hr. Injectors
Description_FAB Full Color Touchscreen for Initial Setup/Tuning/Gauge Displays
Description_FAB Gen 3 Ultra Dominator Style 4 Bolt Air Cleaner Flange
Description_FAB Integrated Ignition Timing Control
Description_FAB Programmable Launch Control Via 2-Step/Timing Retard
Description_FAB Self-Tuning ECU Means You Dont Have To Be A Computer/Tuning Wiz
Description_FAB Simple Calibration Wizard - No Laptop Required
Description_FAB Supports Up To 1500 HP NA Or 1250 HP Forced Induction
Description_INV SNIPER STEALTH 4500 8-INJ; GOLD
Description_LAB Proposition 65
Description_MKT 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
Description_MKT The Sniper Stealth 4500 EFI system 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 features multiple Input/Output options for sensor inputs and switched outputs to control external relays. This system comes with a USB to CAN tuning cable and free downloadable Sniper EFI Software give you unlimited control of your engine. * 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.
Description_SHO TBdyAssy
Flange 4500
height 9.5
length 14.5
Throttle Bore 2.125 in.
WARNING CA Proposition 65 Yes
WARNING CA Proposition 65 Message WARNING: Cancer and Reproductive Harm - www.P65Warnings.ca.gov
weight 13.6
width 12.7
Fitment
Here's What OUR CUSTOMERS Have to Say:

Since 2018, We've Shipped Over 35,000 Automotive Parts to Canadian Customers.

4.6/5

+3,076 Verified Reviews

Easy to find and order. Customer service was responsive and helpful. It fit my vehicle and is protecting the back of it very well

Specific parts for my vehicle were easy to find Shipping was good and website is clear and easy to use

Very happy with the running boards, and the shipping was prompt.

Super easy, discount code worked well for my order

I will buy from here again.

Easy to use site, comprehensive descriptions. Relevant results

Quick shipping, good prices. Great selection of products.

Super easy, discount code worked well for my order

Easy buying process. Fast shipping. Lots of selection!

Great prices looking forward for possible tonneau cover from your site

Quick response and went the extra mile to answer my questions. Very professional and knowledgeable, having nothing but good things to say about the team at TPS

Fast and Quick,easy to understand The product was excellent and packaged extremely well, I would recommend them to all my friends.

The staff was very helpful and the price point is fair. Rafael was very accomodating and responsive to request to cancel order and reorder a different tuner.

Excellent service and price is good too Thanks.

Good service !

Purchasing process was extremely fast and simple, and the product came on time. 5/5 stars.

Need Help? We've Got Answers.

Find quick solutions to the most common questions about shipping, returns, compatibility, and support.

How do I know if a part fits my truck?

Use our vehicle filter by entering your truck’s year, make, and model. If you're unsure, our support team is happy to help.

Do you ship across Canada?

Yes! We ship to all provinces and territories in Canada. Free shipping is available on qualifying orders.

How long will it take to receive my order?

Delivery times vary depending on your location and item availability. Most orders arrive within 2–7 business days.

What is your return policy?

We accept returns within 30 days of delivery, as long as the item is unused and in its original packaging.

How can I contact customer support?

You can reach us via email, phone, or through the contact form on our website. Our team is ready to assist you.

Still have questions?

Our team is here to help — reach out and we'll get back to you as soon as possible.

Compare products

{"one"=>"Select 2 or 3 items to compare", "other"=>"{{ count }} of 3 items selected"}

Select first item to compare

Select second item to compare

Select third item to compare

Compare