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Description
Holley 550-872 Sniper Stealth 4150 Self-Tuning Fuel Injection System 4150 FlangeOverview: The Sniper Stealth 4150 EFI system from Holley features 4, 100LB HR Fuel Injectors capable of supporting up to 650 HP naturally aspirated or 600 HP on forced induction applications. The Super Sniper Stealth 4150 EFI system from Holley features 4, 100LB HR Fuel Injectors capable of supporting up to 650 HP naturally aspirated or 600 HP on forced induction applications. The 8 injector variation is capable of supporting up to 1250 HP on forced
Overview:
The Sniper Stealth 4150 EFI system from Holley features 4, 100LB/HR Fuel Injectors capable of supporting up to 650 HP naturally aspirated or 600 HP on forced induction applications. The Super Sniper Stealth 4150 EFI system from Holley features 4, 100LB/HR Fuel Injectors capable of supporting up to 650 HP naturally aspirated or 600 HP on forced induction applications. The 8 injector variation is capable of supporting up to 1250 HP on forced induction applications. The Sniper Stealth 4150 ECU is capable of complete ignition timing control, fuel self-learning, improving idle stability, drivability, and wide-open throttle horsepower! Did we mention that the Stealth 4150 also includes transmission kick down provisions for GM TH350/400, 200R4/700R4 and Ford C4/C6 applications? Master Kits include complete fuel system with an external fuel pressure regulator preset to 58.5psi, 20ft of 3/8" Vapor Guard Fuel Hose, Fuel Pump, Filters, necessary hardware and bulkhead fitting to return fuel into the tank!
Features:
- Bolt on 4150 flange carburetor replacement fit's a wide range of factory intake manifolds
- Throttle body mounted ECU - no extra boxes to mount
- Supports up to 650HP with four 100lb/hr injectors or 1250HP with eight 100lb/hr injectors
- All of the wiring exits below the rear fuel injector cover, for a completely stealth installation.
- Timed spark part for vacuum advanced distributors located under the front fuel bowl, for easy access to the distributor.
- Air entry is machined to fit most stock style air cleaners with air cleaner locator provisions
- Only 4 wiring connections required! (Battery +, battery - , switched ignition & RPM)
- Requires use of external fuel pressure regulator, Holley PN# 12-886 or equivalent, set to a base pressure of 58.5 PSI
- Integrated ignition timing control improves idle stability, drive-ability, and wide open throttle response
- High resolution full color touchscreen for initial setup, tuning, and gauge displays
- Simple calibration wizard (answer a few questions about your engine and it creates the base map, then starts tuning on its own!) - NO laptop required!
- Self-tuning ECU means you don-t have to be a computer/tuning wiz to have EFI!
- The included Genuine Bosch LSU 4.9 wideband oxygen sensor provides realtime fuel map learn!
- OEM style TPS/IAC and fuel pressure regulator, for years of dependable service
- Included clamp-on oxygen sensor kit for 2.25" exhaust ensures a leak free oxygen sensor installation, with stainless steel T-bolt clamps and a stainless steel (weldable) oxygen sensor flange
- Also available in Black, PN# 550-871 and Shiny, PN# 550-870 finishes
Application:
| Year | Make | Model | Submodel | Engine Size |
|---|---|---|---|---|
| Universal |
Specs:
| Brand | Holley Sniper EFI |
|---|---|
| CFM | 870 |
| Emission Code | 3 |
| Finish | Classic Gold |
| Flange Style | 4150 |
| Fuel Pressure | 58.5 PSI |
| Height | 3.28" |
| Injector Size | 100 lb/hr @ 58.5 PSI |
| Inlet / Outlet Size | 3/4-16 Female O-Ring (AN 8) |
| MAP Sensor | 2Bar |
| Max Horsepower Rating | 650 Naturally Aspirated |
| Model | 4150 EFI Conversion Throttle Body |
| Product Type | Sniper Stealth EFI |
| Transmission | 700R4/200R4 |
| Transmission | Ford C4/C6 |
| Transmission | TH350 |
| Warning | California Proposition 65 |
Shipping Notes
- Free Standard Shipping on $100+ Orders to the USA.
- Except Preorder products are shipped in 48 hours.
- Delivery to the USA:
- 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
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Product Reviews
★★★★★ 5
Love the uniqueness of the Boot!
Size: 11, Color: Rich Cognac Multi
Sam Edelman never disappoints! I love the chucky heel and the multi-colors and textures. Can't wait to rock these with a leather skirt and turtleneck!
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Reviewed in the United States on January 2, 2026
★★★★★ 5
Must try!! I love them!
Size: 10, Color: Maple Ginger Suede Wide Calf
Get these boots! No break in time, and they fit me like a glove!
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Reviewed in the United States on February 23, 2026
★★★★★ 5
I'm very pleased with the purchase of this bag
Color: Pink
The bag is made of a very subtle pink, supple leather. It seems to be of good quality and I hope that over time, with wear, this turns out to be true. It's a good size -- not too small, not huge, but just enough to fit plenty of necessities for a day or evening out. The style is sleek and uncomplicated, making it versatile enough to be worn on casual days as well as a night out. The top is secured with a smooth-running zipper that keeps everything safe yet easily accessible. The shoulder strap is adjustable to various lengths including one that is very long which is my preference. The handles are wrapped in matching leather and very comfortable. The only improvements I'd make to the bag is the addition of brass feet on the bottom and I'd make the zipper pocket on the outside back of the bag slightly wider so my phone would fit into it. Overall, I like it very much and have already recommended it to family and friends.
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Reviewed in the United States on April 29, 2026
★★★★★ 5
Affordable quality!
Color: Sorrel
This bag is beautiful! Just bought it for my early September trip to Newport. Spot on for color early Fall. Soft and stylish. I opted to buy silk scarfs in various colors and they looked great. May start doing my own videos! Nice large quality zipper. Affordable. Great for travel due to it's neutral color. Great gift - neutral. I purchased the smaller size and it was very generous in size. Great for a day out - where you may need a few extras with you. But dressy enough for evening - especially with a silk scarf wrapped on the handle. Includes crossbody strap if you'd like that. Susan C. The LUXE life - YouTube
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Reviewed in the United States on September 26, 2025
★★★★★ 5
My 1st adult purse ❤️
Color: Sorrel, Color: Sorrel
**{I am doing this review to share information that I greatly wish others would have shared in theirs.}**
Comes in a plastic bag and wrapped nicely inside a dust bag with padding to ensure it doesn't crease. I appreciate how carefully it was packaged. Once opened the smell was not strong by any means and it does have that subtle leather scent.👃🏻 The handle portion is sturdy and incorporated into the entire purse so it will hold up well but I am concerned about the leather wrapping around the handle and worth it may unwrap over time.🎀 I loved this bag because It has the option to use as a crossbody which which toddlers you'd be surprised how much it's needed especially after using a purse without one.👛 The color is exactly as pictured and it's a warm tanned brown. 🤎It's darker in certain areas which definitely gives it that genuine leather look and feel. The material is soft and plyable without it creasing easily. I love the bend it has and it welds to my body without feeling like a box that bangs against my body as I walk.🪨 The interior is a silky maroon color❤️ and feels thick and nice quality. The pockets are spacious and offer excellent organization. You have the 2 open pockets for you easy to access items, one center large zipper pocket that seperates the bag, then one internal side zipper pocket for your delicate items. The outside zipper pocket doesn't go very deep but it does hold a cell phone, box of flossers, pepper spray, etc. 🔗The zippers are heavy duty and a nice shiny silver. They open and close smoothly and don't snag. There was a couple loose threads inside the bag when I received but they were not attached to anything. 🪡As you can tell by the images, I have loaded this bad boy up with all my necessities and it all fits. I do plan on downsizing to make it less full and bulky but it is helpful to know it will hold a lot. I appreciate the flat bottom on the bag so it sits upright and keeps things in their place. Once you have filled one of the pockets I will say it does lessen the ability to fill the other pockets due to its size and their isn't any give to keep stuffing it so be aware this isn't your EVERYTHING bag. This was my 1st, over $30, big girl purse purchase. I've never owned a leather purse and I've done countless research to find the perfect one to suite my needs plus saved money on the side specifically for this purchase and I kept returning to this one. 💸There are a lot of sellers of this particular bag and some don't have good reviews but this one did. 💯I did opt to use my own purse strap and that another reason I chose this color. I am 5'4" tall and 115lb to help with size reference. (That was the one thing I wish people would've shown in the reviews)📏 It's the perfect size for daily use. I am a month shy of 33yrs old and I absolutely love this purse. I feel like it goes with every style and the versatility of the strap makes it work for any adult. It is an adult bag and wouldn't recommend for a teen or young adult.🎁 I would most definitely gift this bag to family members and I cannot speak to the ease of cleaning as of yet. 🧽
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Reviewed in the United States on March 9, 2026