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For Your Every Summer RSVP, with Code: SUMMER15
Description
Holley Sniper Stealth 4150 - ShinyHolley Sniper Stealth 4150 Shiny Supports Up To 500HP 3. 5 in. Handheld Monitor For Spreadbore Manifold Return Fuel System Overview Are you tired of rebuilding the 50+ year old Rochester?????? Quadrajet???? (Q Jet??????) on your classic Chevrolet, GMC, Buick, Oldsmobile, or Pontiac? The Sniper EFI Quadrajet?????? is here to help! The first bolt on spreadbore electronic fuel injected throttle body system that does not require any additional adapters,
Holley Sniper Stealth 4150 - ShinySupports Up To 500HP - 3.5 in. Handheld Monitor - For Spreadbore Manifold - Return Fuel System
Overview
Are you tired of rebuilding the 50+ year old Rochester?????? Quadrajet???? (Q-Jet??????) on your classic Chevrolet, GMC, Buick, Oldsmobile, or Pontiac? The Sniper EFI Quadrajet?????? is here to help! The first bolt-on spreadbore electronic fuel injected throttle body system that does not require any additional adapters, sealing plates, or intake manifold swaps! The Sniper EFI Rochester Quadrajet?????? (Q-Jet) system retains the same great features as the 4150 Sniper EFI version such as; four 100lb/hr Injectors, built-in timing control, a 3.5" full-color touchscreen, and much more! This throttle body will support up to 500 horsepower naturally aspirated. In addition to all of these great tried and true features, the Sniper EFI Rochester Quadrajet?????? (Q-Jet) system will fit most stock air cleaners and offers multiple fuel inlet configurations that allow for a stock appearing installation! When it comes to converting to EFI, Sniper is the absolute best way to upgrade your car to fuel injection with just 4 simple connections required. Sniper is designed to be installed at home in your garage or driveway with limited tools and the support of Holley's comprehensive installation manual and videos. An afternoon in the garage and you will be enjoying improved engine performance, better MPG's and easier starting. After the simple installation it's time to let your Sniper begin the self-tuning process. Our user-friendly calibration wizard allows you to just answer a few questions about your engine and the system will begin self-tuning with no laptop required. You don't have to be a computer wiz or specialize in tuning to use a Sniper EFI system! Use the high resolution 3.5" full color touchscreen for tuning and gauge displays. The Sniper EFI Master Kit includes a complete fuel system consisting of; 20ft of 3/8" vapor guard fuel hose, fuel pump, filters, and all necessary hardware to return fuel into your tank. Additionally, you're getting a 4.9 wideband oxygen sensor with a leak free oxygen sensor, oem style TPS/IAC, fuel pressure regulator, all Stainless Steel T-Bolt clamps and a Stainless Steel weldable flange. Sniper EFI is part of a complete ecosystem! Your new Sniper kit pair's seamlessly together with Holley's Sniper Hyperspark Ignition, Fuel System's, Air Cleaners, Throttle Body Digital Dash to unlock the full potential of your build. Complete your fuel injection journey by checking out our full offer of ignition, fueling and accessories!
Features:
- Bolt on 4150 Flange Carburetor Replacement
- Self-tuning ECU means you don??????t have to be a computer/tuning wiz to have EFI!
- 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!
- High Resolution Full Color Touchscreen for Initial Setup, Tuning, and Gauge Displays
- Only 4 Wiring Connections Required! (Battery +, Battery - , Switched Ignition RPM)
- Throttle body mounted ECU ???? no extra boxes to mount
- Supports up to 650hp with Four 100 Lb/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.
- An external fuel pressure regulator is required, set to a base pressure of 58.5 PSI, e.g. 12-886.
- Integrated ignition timing control
- The included Genuine Bosch LSU 4.9 Wideband Oxygen Sensor provides real-time Fuel Map Learn!
- OEM Style TPS/IAC 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
- vailable in 3 finishes: Shiny, Black and coming soon, Gold
Details:
- CFM: 870
- Finish: Shiny
- Flange Style: 4150
- Fuel Pressure: 58.5 PSI
- 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
- Transmission: 700R4/200R4
- Transmission: Ford C4/C6
- Transmission: TH350
Links
Instruction Sheet
Instruction Sheet
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
4.9 ★★★★★
Based on 28 reviews
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Product Reviews
★★★★★ 4
Good filter.
Great filter works well .
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on May 12, 2026
★★★★★ 5
Efficient long lasting. Great Value
Style: CF10735 Classic
These filters (my second one) has lasted me over two years with a little maintenance in between, (removing from time to time to vacuum and shake out the bigger debris.) They do a great job of keeping the cabin air really clean and fresh.
1) Over designed and built (Good thing) installed without effort.
2) Fit and finish is perfect for my 2016 Genesis G80
3) Carbon filter works well but after about six months it no longer absorbs orders, This is excepted especially when I have not swapped it out for over two years.
4) Great value and honestly I should be replacing these cabin filters out ever six months for efficiency and order control.
Note: When I decided to replace it the filter held up structurally as the day I installed it. The charcoal beads where all intact as well.
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on January 30, 2026
★★★★★ 5
Better than OEM, AC is so fresh now!
Style: CF10374 Classic, Style: CF10374 Classic
YEEEEEEAHHHHH!
This went straight from the mailman's hand to my 2010 Tacoma.
-Fits better than OEM and Replacements!
-AC smells so fresh now!
-Easy installation without any complications.
-Has a foam gasket around the filter that makes it fit like a glove, thight and secure!
-Very Well Made and quality materials.
Won't be returning this one, will actually buy it for the rest of my cars!
⭐️⭐️⭐️⭐️⭐️
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on May 11, 2026
★★★★★ 5
Perfect fit.
Size: 1" x 1" x 1"
Fits perfect in a 2025 Toyota Tacoma high quality good performance.
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on May 10, 2026
★★★★★ 5
Better Than OEM – Worth the Upgrade
Size: 1" x 1" x 1"
The K&N filter is a big step up from the standard Toyota air filters and OEM replacements. Installation was quick and easy, and the fit is perfect. I’ve noticed smoother airflow and better throttle response compared to the stock filter. The best part is that it’s washable and reusable, so it’s a long-term investment instead of constantly buying replacements. Definitely a smarter choice for anyone who wants performance and value over the typical paper filters.
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on August 25, 2025
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