Fuel-It! Port Injection Kit — S58 (G8x M3/M4, G87 M2, X3 M / X4 M)
Fuel-It! port injection kit for the S58 — the G8x M3/M4 (including M3 Touring and M4 Convertible), G87 M2, and F97 X3 M / F98 X4 M. Low-pressure port injection across all six intake runners, backing up the S58's direct injection for big power on pump, race gas, or E85 (Fuel-It rates the kit up to 1,000+ whp with the right injectors).
What it is
A Fuel-It S58 billet fuel rail, up to six flow-matched port injectors (sized to your choice), stainless-braided lines, a port-injection controller, and the install hardware/jig. It supplements the factory DI; injector size sets the power ceiling.
Options
Three choices in the configurator. Injector: No injectors (rail and hardware only, to carry over your own set), or 550, 750, 950, or 1050cc — size it to your power target. Controller: Standard fires the port injectors as a batched bank; CANfuel Sequential is Fuel-It's CAN-bus controller that fires each injector in sequence with the engine for finer fuel control. Flex-Fuel: None, reuse your existing flex-fuel sensor, or add a new sensor.
Where it fits in the build
Supplemental fuel for high-power S58 builds. We tune the engine to the fuel system.
Fitment
S58 — G80 M3, G81 M3 Touring, G82 M4, G83 M4 Convertible, G87 M2, F97 X3 M, F98 X4 M. Confirm your chassis in the selector.
Sourcing fueling with the tune? The Fueling Kit — S58 bundles the matched parts + calibration for 8% under à la carte.