Tag Archives: 550-510d

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Holley Sniper EFI 550-510D 4BBL Fuel Injection Returnless Master Kit Shiny

Holley Sniper EFI 550-510D 4BBL Fuel Injection Returnless Master Kit Shiny. Are you waiting to convert your carbureted vehicle to Sniper EFI, but don’t like the idea of mounting an external fuel pump? Introducing Sniper EFI Master Kits, with a Returnless Retrofit Fuel Module. This contains combines the Sniper EFI Self Learning Throttle Body, with an easy to install In-Tank

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