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]
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SKU: 6482427597

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Christopher Watson
Fort Morgan, US
★★★★★ 5
Great and ubex
Size: Ultra Slim (2.75-Inch Height), Color: Blue
Wonderful product. Light and very comfortable. I use it to support my bad back and it has helped a great deal.
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Reviewed in the United States on May 30, 2026
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Lisa A
Belleville, US
★★★★★ 3
Thin but dense
Size: Ultra Slim (2.75-Inch Height), Color: Blue
i like the thin size but it's very dense -- if you like that. i prefer more fluff/air
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Reviewed in the United States on March 21, 2026
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Katerina W.
Charlottesville, US
★★★★★ 5
Perfect Pillow!
Size: Ultra Slim (2.75-Inch Height), Color: Blue
I have spent so much money trying to find the right pillow. As a side sleeper I would always wake up with a stiff neck but not with this pillow! It’s a perfect height and the pillow stays fairly cool. It’s totally my Goldilocks pillow!❤️
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Reviewed in the United States on May 29, 2026
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linda earthsong
Whiting, US
★★★★★ 5
Great!
This SUPA MODERN Reading Pillow is absolutely what I have been searching for. I added a thick mattress topper to my twin bed and suddenly the wedge pillow I had was below the top of the mattress so I needed something else to put against the rails at the head. This reading pillow is almost exactly the same width as this standard twin. The pillow was shipped vacuum packed and looked so lumpy I was fearful it would never be comfortable but I followed the instructions and left it alone except for an occasional shake to fluff it for 72 hours. As often as I get stuff that’s vacuum packed I was still amazed by how this turned out. It’s very full and firm I’m sure some folks will like that you can remove some of the filler to soften it but I find it very comfortable as is. The shape does give it a little more lumbar support than similar pillows I have had in the past. The fabric cover is super soft but has yet to make me overheat. It does have pockets on the arms but they’re not very big I wouldn’t put much in there I was worried about falling. This is not the cheapest reading pillow but it’s far and away not the most expensive. As I was writing this review I saw that it has been marked down 20% PLUS there’s a 30% off coupon. That puts it down around the cheapest price point for a far superior pillow. Go get one NOW!!! I highly recommend this Reading Pillow!
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Reviewed in the United States on November 30, 2024
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CYates
Chelsea, US
★★★★★ 5
Great pillow to relax with.
I ordered this pillow specifically, so my son has something to sit against when he comes to work with me. He absolutely loves it, the pockets are great, it provides enough comfort and support for him to play his video games and read while I get things done. It does need a couple of days to fully settle and puff up, and there is a bit of a smell as there is with most pillows that have this time of filling and are smooshed and wrapped in plastic. That smell goes away in the couple of days it takes for the pillow to fully expand. This pillow is great for lounging, kids sitting on the floor watching movies, to using it in bed to sit up and read, play video games or study. It also would work really well for deeper couches and shorter people. I love that the cover is washable, as that is pretty mandatory in our house with kids and pets. I am very impressed with the quality.
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Reviewed in the United States on December 27, 2024

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