SKU: 81238612722

Holley Sniper EFI 4BBL Self Tuning System with PDM,Black (HO550-511-3PX)

Sale price$1615.05 Regular price$1794.50
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Description

Holley Sniper EFI 4BBL Self Tuning System with PDM,Black (HO550-511-3PX)HO550 511 3PX HOLLEY SNIPER 2 EFI BLACK 800 cfm 4 Injector Throttle Body, 650 HP N A Part Number: HO550 511 3PX The #1 EFI conversion system just got better! Introducing Sniper 2 EFI a self tuning, easy to install, EFI conversion for common 4 barrel (4150 flange) style carburetors. We took everything that we learned from the original Sniper EFI system and added 14 new features that will make your EFI conversion more simple, reliable, and modern. Like

HO550-511-3PX - HOLLEY SNIPER 2 EFI BLACK

800 cfm 4 Injector Throttle Body, 650 HP N/A

Part Number: HO550-511-3PX

The #1 EFI conversion system just got better! Introducing Sniper 2 EFI - a self-tuning, easy-to-install, EFI conversion for common 4-barrel (4150 flange) style carburetors. We took everything that we learned from the original Sniper EFI system and added 14 new features that will make your EFI conversion more simple, reliable, and modern. Like all Sniper EFI systems, Sniper 2 is designed to work with the Sniper Ecosystem that includes Hyperspark ignition, complete fuel systems, multiple user interfaces/dash displays, and more.
New for Sniper 2 is the optional Power Distribution Module (PDM). This cost-effective and optional accessory isolates the core of your EFI and ignition wiring into one, easy-to-use location. Simply slide the stripped wire ends under the positive lock connector and tighten down the set screw. Battery and a switched 12-volt source is all that's required from your vehicle to power the PDM and your Sniper EFI.
Make your classic drive like a modern fuel-injected vehicle, including easy cold starts, smooth drivability, and improved fuel economy! Sniper 2 is designed to be installed at home in your garage with limited tools and the support of Holley's comprehensive installation manual and videos. The user-friendly setup wizard allows you to answer a few simple questions about your engine and the system will begin self-tuning with no laptop or tuning experience required.
If you're looking for a high-performance fuel injection system that delivers power, efficiency, and ease of use, look no further than the Sniper 2 EFI.
Main Features
All new design – the #1 EFI Conversion just got better!
Only four wiring connections required: Battery+, Battery-, Switched Ignition, and RPM
Calibration wizard only requires that you answer a few simple questions about your engine to create a base map and begin self-tuning – No laptop required
Supports up to 650hp naturally aspirated or 575hp on boost with four 100 lb/hr injectors
NEW Next generation ECU features improved RF noise and interference resistance (stands up to old car wiring, noisy alternators, faulty plug wires)
NEW Redesigned throttle shaft and plate geometry for a smoother throttle feel

Sniper 2 is Part of the Sniper EFI Complete Ecosystem

Sniper 2 is compatible with the complete Sniper EFI Ecosystem that includes plug-n-play Hyperspark Ignition systems (coil, ignition box and distributor), fuel systems (fuel lines, fuel pump hangers), multiple displays and more
NEW Main harness includes plug-and-play HyperSpark distributor support, for integrated timing control, making your ignition setup hassle free
NEW Adaptors for other ignition types sold separately: 558-329 CD Box to Sniper 2, 558-330 MSD Pro Billet / Crank Trigger to Sniper 2
NEW Wide Variety of tuning and gauge display interfaces: from a 3.5-inch full color LCD Handheld, 5-inch Digital Dash, or the Bluetooth dongle, which allows you to connect either an iOS or Android based cell phone to your Sniper 2
NEW Optional Power Distribution Module (PDM) further simplifies wiring, especially when used in conjunction with an ignition system
Available with fuel system kits: a complete fuel system consisting of: 20 ft. of 3/8 in. Vapor Guard Fuel Hose, Fuel Pump, fuel pressure regulator, filters, necessary hardware, and bulkhead fitting to return fuel into the tank

Additional Features
NEW Integrated transmission kick down provisions for GM TH350/400, 200-4R/700R4 and Ford C4/C6 applications
NEW "Hidden Harness" wiring harnesses exits from the rear of throttle body for a clean appearance
NEW Inputs and outputs consist of: 2x Ground Inputs, 2x Ground Outputs, 1x TPS output (0-5v), and 1x Tach Output
NEW Redesigned injector connector for improved reliability
NEW Onboard contactless magnetic TPS sensor e

Shipping Notes
  • Free Standard Shipping on $100+ Orders to the USA.
  • Except Preorder products are shipped in 48 hours.
  • Delivery to the USA:
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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]
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SKU: 81238612722

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A
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Adrian Ramirez
Los Angeles, US
★★★★★ 5
LOYEE 8‑Pack Puppy Toys — Cheap, Tough, and My Pup Loves ’Em
Style: 8 - Pack Frog
I grabbed these LOYEE toys because my little teacup dog needed something to chew when the boys are loud and I’m making lunches. For the price they’re surprisingly durable — survived a few rough play sessions without falling apart — and the different shapes keep her interested so she’s not chewing shoes. They’re soft enough that the twins can toss them without hurting the pup, and washing them is easy when they get drool or dirt on them. If you need an inexpensive pack to keep a small dog entertained and not chewing up your tools or kids’ stuff, these do the job.
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Reviewed in the United States on June 11, 2026
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Globetrotter
Waukegan, US
★★★★★ 4
Great value
Style: 8 - Pack Frog, Style: 8 - Pack Frog
deal. Got it for my pups gotcha day. He is not a heavy chewer so this was perfect for him.
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Reviewed in the United States on March 21, 2026
A
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Angel Gabriel
Fort Morgan, US
★★★★★ 5
Highly recommend!
Style: 8 - Pack Frog, Style: 8 - Pack Frog
All the plush type toys and the frog have a great squeak toy in them that isn't too loud like most!! All are a decent size and have kept my girl entertained since I opened the package!! Love that they are bright and vibrant colors and seem to be very good quality!! My 9lh Chihuahua for size reference 😂 actually she wouldn't stop trying to steal them when I was taking the pictures lol. She especially loves the big frog and ball that you can put snacks into! The red bone seems to be a very hard durable plastic so she won't be able to chew it Into small pieces and choke, so very safe!
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Reviewed in the United States on March 2, 2026
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Britt
Birmingham, US
★★★★★ 5
fun for puppy
Style: 8 - Pack Frog
Puppy love them great started toys
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Reviewed in the United States on May 27, 2026
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I. am
Charlottesville, US
★★★★★ 3
Chew ball and carrot only things to last.
The chew ball is awesome. Lasts forever. The carrot and multicolored rope bone also last and are very durable. The flamingo lasted ten minutes and the stuffing went everywhere quickly, I converted it into a makeshift smaller rope chew, lol. The banana had appeal….but my dogs destroyed it in two days. I liked the banana but it is flimsy. So far I’ve sequestered the Star and “meat” toys, they don’t look to durable. It’s a cheap product so you get what it’s worth. I wanted a cool flamingo but the flamingo was the easiest for my Brussels Griffon to destroy. All in all the carrot and chew ball are good but the rest not so much. Two stars.
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Reviewed in the United States on November 1, 2022

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