For muscle-car builders, LS swappers & performance shop pros
Stop guessing which kit to run — get the EFI conversion guides that actually match your build
From the $399 entry-level question to closed-loop tuning on a 700-hp LS, we break down what owners report, what the numbers show, and which systems are worth your money.
Editor's Top Picks
What we'd buy
Our standout recommendations across every guide. Prices and availability change; we may earn a commission on purchases.
What you'll find here
Everything the swap manual leaves out
Kit comparisons, fuel system deep-dives, and wiring walkthroughs — written by builders for builders, with no fluff and no filler.
EFI Kit Comparisons & Tuning
Side-by-side breakdowns of the Holley Sniper 2, FiTech Go EFI 4, MSD Atomic AirForce, and beyond — mapped to real build scenarios so you know what each system demands before you order. We pull from owner reports and dyno-validated tuning data to tell you where self-learning ECUs earn their keep and where they hit their ceiling.
Browse the guides →
Fuel System & Delivery
Pump flow rates, AN line sizing, return-style conversions, pressure regulators, and injector selection — the unglamorous parts that make or break EFI reliability on the street and strip. We map out what owners consistently call out as failure points and walk you through the specs that actually matter for your horsepower target.
Browse the guides →
Wiring, Sensors & Integration
Standalone harnesses, MAP sensors, wideband AFR controllers, and LS-swap-specific ECU paths — the electrical side of an EFI build where most swaps stall or go sideways. Our guides break the process into stages so you're not staring at a 40-pin connector wondering where to start.
Browse the guides →