One thing to take into account with the Holley Sniper systems is that they can run only a maximum of around 16 psi of boost, ok if you have a well built big engine with very good heads-but not much good if you have a smaller engine with average heads. I had this discussion with Steve Morris as I had intended using a Sniper 4500 unit on my 400 combo at 25 psi of boost, he said it will only accurately meter fuel to 16 psi boost, above that and you're off the fuel map,running on a wing and a prayer effectively.
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