Patent pending stealth technology no computer needed to adjust efi when additional fuel delivery is needed when modifying engines tap-on stealth technology (doesnt interfere with stock ecu map) uses carburetor tuning logic. simple to adjust with a screw driver increases horsepower improves throttle response simple plug-in design installs in minutes with optional factory type wiring harness (some models include wiring harness as noted) led lights indicate fuel delivery settings while tuning wont interfere with stock sensors and inputs compact size - 3 long x 1 wide x 5/8 thick tap in tfi box connects to stock wiring with quick splice connectors