Testing out FiTech's new EFI throttle body system on an iron 5.7L LS engine. Intake is a single-plane Holley unit.

Aftermarket EFI is nothing new. In fact, the first high-performance electronic fuel injection systems were introduced before some of our readers were even born. Those units were expensive, hard to ...

We have to admit, we were somewhat perplexed when we decided to apply the Holley Terminator Stealth EFI system to our modified 5.3L LS. Our bewilderment had nothing to do with the ability of the ...