Holley Sniper 2 EFI 4BBL Self Tuning Base Kit, Black (HO550-511-3XX)
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:
  1. Standard Shipping : 3-10 business days
  • If time is of the essence, please consider selecting expedited delivery for faster service.
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: 89317424536

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4.6 ★★★★★
Based on 1228 reviews
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Product Reviews
C
Verified Purchase
Christine
Boise, US
★★★★★ 3
Closing it when you have a ring.
Color: Black, Color: Black
Its a nice box but the problem i have with it is the middle piece. It does not give enough room if you have a ring that sits high like a cocktail ring. And same if you have a pendant necklace in the necklace area. You have ro really force it closed and i worry that it will put pressure on the items. It would work better without that middle piece for earrings or maybe if it were half the size. Closes fine when its empty but the minute you put a ring in the ring spot that has any kind of height you have to squeeze it shut. Its a good little box that you can put in a safe. Thats why i use it. Just to put my good jewelry in it and then secure it properly in a small house safe. Also ive already had the backs of a few earring pop off when I've opened the earring flap because it all rubs together. .
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on February 14, 2026
G
Verified Purchase
G. M.
Draper, US
★★★★★ 5
Super usefull
Color: pink
If you're in search of a stylish and functional way to organize your jewelry while on-the-go, then this pink travel jewelry organizer is definitely worth considering. With its compact design and thoughtful features, it's the perfect accessory for any traveler or jewelry lover. One of the standout features of this organizer is its size. With a compact design that can easily fit into a purse or suitcase, it's perfect for taking your jewelry with you on the go. And despite its small size, it still offers plenty of storage options - from compartments for necklaces and bracelets to slots for rings and earrings, it can hold all of your essential pieces. But beyond its size, this travel jewelry organizer is also incredibly stylish. The soft pink color adds a feminine touch, while the sleek design and gold-tone hardware give it a sophisticated look. It's the perfect accessory to carry with you on any trip or to use as a daily storage option for your jewelry. Another great feature of this organizer is its thoughtful design. The compartments and slots are all padded to protect your jewelry from scratches and damage, while the zippered closure ensures that everything stays secure and in place. Plus, the compact design means that you won't have to worry about your jewelry getting tangled or jumbled together during travel. Overall, if you're in need of a travel jewelry organizer that is both stylish and functional, this pink option is definitely worth considering. With its compact size, ample storage options, and thoughtful design features, it's a great investment that will help you keep your jewelry organized and protected while on the go.
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on April 22, 2023
A
Verified Purchase
alessa
San Leandro, US
★★★★★ 5
Great value, great product!
I use this as a home jewelry box - I don't wear a lot of jewelry, so it fits my needs perfectly. Its pretty lightweight and would be good for travels as well. The outside is leather-like and seems to be waterproof so far. I use the first layer for jewelery and second layer to store my hairclips and pins. I've had it for a few months and it seems to be great quality and durable! Definitely a good value as well because I've seen similar jewelry boxes sold at popular retail stores for over $30.
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on January 21, 2026
M
Verified Purchase
Marie
Lowell, US
★★★★★ 5
Lovely Slate Gray Jewelry Box
I just received this Slate Gray jewelry box. It's really quite lovely and just the right size for my granddaughter's vanity. I'm really excited about giving it to her, for her 12th Birthday, to hold her better jewelry. It's so nice I'm going to order another one for my other Granddaughter's Birthday.
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on December 5, 2025
C
Verified Purchase
Cathy D.
Birmingham, US
★★★★★ 5
Songmics Slate Gray Travel Jewelry Box
I purchased the slate gray Songmics jewelry box for travel purposes. We take long vacations and have an upcoming 20 day cruise. I wanted a jewelry box that was compact enough to put in my carry-on bag, but still had room to hold a months worth of jewelry, especially to keep my necklaces for tangling. When this arrived, I was pleasantly surprised and the packaging was great, shipped in a sturdy box. so no damage to the jewelry box. The color is a rich gray and the 2 tier box, while small, holds a lot of jewelry. I wanted to purchase the ink black but could not justify paying twice the price of the gray one just to get it in black. It is small enough that it will fit in most any hotel/ship safe so I won't be sitting out in the room anyway. It has a strong magnetic snap that keeps the box from opening while in transit. The one negative for me is that the pierced earring card is so thick that my earrings barely go through to have enough room on the back side the slip the backs on. I may separate the double thick card, realizing it will not look as nice but will be more functional. The bottom half of the box will hold bracelets up to 1 1/4" wide. There is enough room under the earrings card to place pendants, additional earrings, etc. The necklace holder is designed to hold 5 necklaces, but I added one more by going across the top, end to end, to prevent tangling. I also placed smaller hoop earrings in the ring holder which holds them securely. This box held 7 bracelets, 2 of which were wide, 5 rings, 9 necklaces (I placed 3 in the bottom of the box, and had room for 23 pair of earrings (some placed in the ring holder and in the bottom of the bo)! I would buy this again in a heartbeat.
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on April 10, 2025

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