Holley Sniper Sniper EFI Self-Tuning Kit 550-510


  • Throttle body mounted ECU
  • Supports up to 650hp
  • Only 4 Wiring Connections Required
  • Shiny finish
SKU: HLY550-510 Category:

Holley Sniper Sniper EFI Self-Tuning Kit – 550-510

When it comes to converting to fuel injection, Holley EFI is the standard. The Holley Sniper 550-510 self tuning kit is perfect for most vehicles with a 4-barrel carb. (If you’d like to see the full line of Holley EFI offerings here at Karl Kustoms, check out this page.) Converting to Holley EFI can help get rid of rough starts, hesitations, vapor lock, and flooding. A full-color touchscreen calibration wizard is included. Answer a few questions about your engine, and the calibration wizard will start tuning your engine. If you’re looking for more in-depth offerings here at Karl Kustoms, check out our Connect and Cruise systems in this post.

What’s Included

  • Dual pattern bolt-on carburetor replacement with 4150 flange fitment
  • throttle body mounted ECU
  • Bosch LSU 4.9 Wideband oxygen sensor
  • touchscreen calibration wizard
  • necessary hardware

Important Notes

This is a dual pattern bolt on carburetor replacement, designed to fit 4150 flange & spread bore manifolds.

Note: Spread bore sealing plate part #9006 is recommended) and supports up to 650hp with 4 100 Lb/Hr injectors.

When converting your carbureted classic, Holley EFI systems have been leading the pack for a long time. At Karl Kustoms, we’re happy to help with your Holley EFI conversion; it’s something we often install in our in-house custom shop. We have a lot of experience with the product and can answer almost any question.

Weight 10.9 lbs
Dimensions 14.6 × 9.6 × 12.5 in




Off-Road Racing Use Only

Manufacturer Part Number


Holley Sniper Sniper EFI Self-Tuning Kit Specs

  • Internal fuel pressure regulator offers preset 58.5 PSI pressure.
  • High-resolution full color touchscreen for setup, tuning, and gauge display.
  • Calibration wizard creates a base map and tunes for proper fuel injection conditions.
  • Offered in base or master kits – master kit includes 20ft fuel hose, 12-920 fuel pump, and filters.
  • Clamp-on oxygen sensor kit with stainless steel hardware.
  • Finish: shiny


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Prop65WARNING: These auto parts can expose you to chemicals including phthalates and lead. Installing or using these parts can expose you to other parts containing these chemicals and to engine exhaust, which are known to the State of California to cause cancer and birth defects or other reproductive harm. For more information go to