Fortunately, the aftermarket soon stepped in by developing stand-alone engine management systems that took over fuel and spark duties from stock PCMs. The aptly named Fuel Air Spark Technology (FAST) ...
During development testing, the FAST crew spent several hours tuning a GMPP 572 crate motor with its top-of-the-line XFI system, which netted 630 hp. FAST then replaced the XFI system with an EZ-EFI ...
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