Holley Sniper 2 EFI 4BBL Self Tuning Master Kit, Black (HO550-511-3XK)
SKU: 6482427597

Holley Sniper 2 EFI 4BBL Self Tuning Master Kit, Black (HO550-511-3XK)

Sale price$1872.45 Regular price$2080.50
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Description

Holley Sniper 2 EFI 4BBL Self Tuning Master Kit, Black (HO550-511-3XK)HO550 511 3XK HOLLEY SNIPER 2 EFI BLACK 800 cfm 4 Injector Throttle Body, 650 HP N A Part Number: HO550 511 3XK 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

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

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

Part Number: HO550-511-3XK

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]
  • Please click here for more details>>> Return & Exchange Policy
SKU: 6482427597

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LucyNYC49
Belleville, US
★★★★★ 5
Doberman of the Corn: The Movie
Size: One Size, Pattern Name: Corn, Size: One Size, Pattern Name: Corn
My Doberman Godzilla loves this corn. She loves it with every fiber of her being and soul. She is spoiled rotten and has more toys than most children (mostly because if a Doberman does not have things to be entertained by, they will invent their own entertainment that involves the destruction of your home.) She destroyed her first corn plush after about a year. There was some kind of diva like fit and her original corn was in tiny pieces. She was subsequently despondent like a Victorian on a fainting couch so I had to find an emergency corn replacement here on Amazon. I have no idea who the buyer for Amazon is and what made them say: “Oh yes, we MUST sell a big corn plushie for dogs” but I am grateful as hell to the way their possibly deranged mind thinks. Because that person and my Doberman think exactly alike.
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Reviewed in the United States on July 15, 2025
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Theresa
Chelsea, US
★★★★★ 5
Sturdy
Size: 20 x 4 x 4 in, Pattern Name: Pepper
Wanted to wait awhile before writing this review to see how it held up. It is the sturdiest soft toy he has had in while! I love the sound it makes, not loud and annoying like some. Not one tear or seam has come loose and believe me this little Shih Tzu is rough on everything. It is bigger than he is and shakes like nothing else can and stay together. I recommend it for any aggressive pet. I can see a ferret running around with it or a big dog.
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Reviewed in the United States on May 3, 2026
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Nancy A Deak
Omaha, US
★★★★★ 5
My baby's fav
Size: 20 x 4 x 4 in, Pattern Name: Banana
Dog loves this. Squeakers very durable. Has become one of his favorite toy. Highly recommend for dogs that love Squeakers. Mine likes them loud. Will not disappoint there!
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Reviewed in the United States on April 9, 2026
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Darla
Draper, US
★★★★★ 5
Wonder toy!!
Size: 20 x 4 x 4 in, Pattern Name: Banana
This is one of the BEST dog toys ever!!! My Baby Girl just loves it. Totally obsessed. I highly recommend this product if you’re able to handle the squeaky noise. I totally can be I see the joy it brings Also, as a proud Mommy moment Sadie Rae stops squeezing the banana when I say ok Baby Girl Mommy has had enough. 💜💜
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Reviewed in the United States on February 11, 2026
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SusanM
Grantham, US
★★★★★ 4
Toy provides much fun and hilarity, seam rips.
Size: 20 x 4 x 4 in, Pattern Name: Eggplant, Size: 20 x 4 x 4 in, Pattern Name: Eggplant
So, I kind of bought this on a whim. But our dogs absolutely love this toy, and it provides many moments of hilarity as watching our medium sized dogs tote this giant toy around, whipping it back and forth, hitting themselves with it, is constant entertainment. The squeaker is still working nearly 6 months later, which is amazing. I only took off one star because I have had to perform surgery on this toy multiple times due to the seam coming open, letting the stuffing out, which is a major issue. I have to take it away from them (which they hate) then find time to sew it up until the next spot opens up. If I was smart, I'd just have reinforced the entire seam the first time, but no one said I was smart.
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Reviewed in the United States on October 27, 2025

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