Holley Sniper 550-511K EFI 4150 4-Barrel Self-Tuning Master Kit. Put an end to mysterious air/fuel ratios, jet changes, and cold-start rough idle troubles with Holley Sniper EFI. Affordable aftermarket fuel injection is here and it couldn’t be any easier to install on your vehicle. Holley Sniper EFI is a perfect match for any muscle car, […]