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Description
Holley 550-872K Holley Sniper EFI Stealth 4150 Kit - Classic Gold FinishOverview: 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? Part # 34-42 is required for a bolt-in installation.
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
4.7 ★★★★★
Based on 18 reviews
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Product Reviews
★★★★★ 5
Batman-Approved Armor for Your Remote
Color: Black, Color: Black
✅ Hi Color Silicone Cover for Apple TV Siri Remote (3rd Gen, 2023) – Shockproof Protective Case with Anti-Slip Grip, Full Button Access, Easy Installation – Batman-Approved Armor for Your Remote
Custom Fit for Apple TV Siri Remote (3rd Gen, 2023): Perfectly designed silicone sleeve for Apple TV 4K remote, ensuring a snug fit without blocking buttons, touchpad, or IR sensor.
Batman-Approved Armor: Tough, shockproof silicone acts like superhero armor—protecting your remote from drops, scratches, and everyday wear.
Anti-Slip Grip for Ultimate Control:
Textured silicone prevents slipping, making navigation smooth and secure—even during intense streaming sessions.
Premium Protection Without Bulk:
Thick enough to absorb impact yet sleek enough to keep your remote stylish and lightweight.
Full Access & Compatibility:
Maintains complete functionality of all buttons, touchpad, and charging port. Compatible with Apple TV 4K (2023 and newer).
Quick & Easy Installation: Stretch and slide the remote through the IR opening—fits perfectly in under 20 seconds.
⸻
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“Because even Batman knows—every hero needs armor. Protect your remote like Gotham depends on it.”
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on November 5, 2025
★★★★★ 5
Probably one of the best products you didn’t realize you needed
Color: Gray
Originally purchased on recommendation from other users after Apple Siri TV remote power button randomly detached and fell out of the remote (which they are apparently VERY prone to do.)
~Do ensure your original power button is not lost.~
Apple‘s smug recommendation to their design problem was to buy a new Siri remote, but this silicone sleeve retains the original power button in place without adhesive and solves over-sensitivity and handling issues with the original button design.
Highly recommend purchasing one of these sleeves to preemptively solve the Siri remote’s power button design and handling sensitivity problems.
Multiple bold color choices also help minimize remote becoming easily lost in blanket and in between couch cushions.
Same sleeve is Apple Lightning and USB-C charger compatible for newer and previous models, as pictured *NOT for first generation remotes!*
Craftsmanship / fit and finish are impeccable
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on May 12, 2026
★★★★★ 5
Just a great case overall
Color: Blue
Great grip case for an Apple TV 4K 2022 model. Especially for kids since my son loves to peel and nudge things off. Colors are great and nothing is covered up. A little tricky getting in but fits great. Arm loop a little tedious but work well.
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on September 6, 2025
★★★★★ 5
Worked perfect with my remote which had lose button
Color: Luminous green
Fit perfect. Nice soft and flexible silicone and very bright. Will help with glow in the dark at night.
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on April 19, 2026
★★★★★ 5
Fits perfectly
Color: Red
This is great. It’s red, which makes it easy to find if it ends up in your cushions. It was a little tough getting it on, but once it’s on, it doesn’t shift, it fits perfectly. Plus, because it’s made of silicone, my remote stays on the arm of my chair or wherever I put it and it doesn’t slip off. Put the lanyard on before installing it on your remote because it’s nearly impossible to do it once it’s on.
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on October 6, 2025
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