SKU: 89317424536

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

$1490.40 $1656.00
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Description

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

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

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

Part Number: HO550-511-3XX

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: 89317424536

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Michaela Ricketts
Lake Worth, US
★★★★★ 5
Let’s Be Honest… I Bought This Hoping for Magic
Let’s be honest-anytime a product says “plumping” or “volume,” my expectations immediately split into two categories: absolutely nothing happens, or I convince myself something happened because I spent money on it. This one actually surprised me. The texture is lightweight but nourishing, and because it’s anhydrous, it feels a little richer without being greasy or heavy. I started using a small amount consistently in areas where my skin looked a little tired or less full, and over time my skin definitely started looking smoother, healthier, and more refreshed overall. One thing I really appreciate is that it doesn’t just sit on top of the skin making you shiny for five minutes and then disappear into disappointment. It absorbs well, layers nicely with the rest of my routine, and leaves my skin feeling soft instead of sticky. The biggest thing I noticed is that my skin just looks more “awake” and healthy lately-like I’ve been drinking enough water, sleeping properly, and making responsible life choices…which may or may not be true. I’ve tried a lot of skincare products that sounded impressive and did very little. This one actually earned a permanent spot in the routine.
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Reviewed in the United States on May 11, 2026
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Chloe
Fort Morgan, US
★★★★★ 5
Good product
I've used a few different volufiline’s and I like this one best. You get a tingling sensation that you don't get from other brands. Most of them are around the same price but this brand seems to have a bit of a larger bottle. I recommend purchasing this product. My smile lines are reducing significantly. I stopped putting it on my under eyes because I read somewhere it can make them worse. You also have to continue using it to keep the changes.
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Reviewed in the United States on May 24, 2026
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Amazon Customer
Los Angeles, US
★★★★★ 5
This makes my face feel amazing
I love how this makes my face feel! It’s still early to tell how effective it’ll be, but I saw friends yesterday that I hadn’t seen in almost a month and they commented how well rested and useful I looked! It was pretty flattering
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Reviewed in the United States on May 31, 2026
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Sarah
Massapequa, US
★★★★★ 3
Recommending with caution
I noticed a slight difference but it did cause some irritation around my eyes. I have very sensitive skin so it’s not that hard to imagine. I have hallows under my eyes and dark circles. It helped lighten them slightly but it also worsened puffiness that was so subtle you wouldn’t have even noticed it. So while it helped the hollows it also caused puffy bumps where people normally would get eye bags. I eye tried to apply with a queue tip just around the edge of the dark circle/hallow. Won’t be using again because I didn’t like the puffiness but I think it’s worth a try with the right application. If you are irritation and acne prone I wouldn’t go for this. It is an oil base and while it’s a thinner oil it still slides around the skin and can get places you don’t want. And to add some context I used this for about 2 weeks for me to see the noticeable difference. Everything prior to that could be placebo. Research online says it should take about a month but as I said, puffiness that was minor became voluminous and noticeable. Wish it was able to stay only where I put it!
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Reviewed in the United States on May 16, 2026
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VNoble
Fort Morgan, US
★★★★★ 4
SUPER OILY Consistency
If you're an oily girl like me, use with caution. This is SUPER oily. When I read serum in the product name, I thought of a gel like serum, not an oil. It is super greasy, so you may want to save this for nighttime skincare. It's too soon to see results but I at least wanted to send out a warning about how oily/greasy it is for my oily friends. If you have drier skin, you may love the super charged shine this lends. I make this kind of shine on my own and don't need more help in that area. Will definitely switch to nighttime use vs daytime.
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Reviewed in the United States on May 22, 2026

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