Fuel-It! Charge Pipe Injection (CPI) Kit — S63TU / N63TU (M5 / M6 / 550i / 650i)
Fuel-It! charge pipe injection kit for the S63TU and N63TU — the F-chassis M5/M6 and 550i/650i. Instead of port injectors in the runners, it injects supplemental fuel into the charge pipe after the intercooler — a simpler way to keep the V8's high-pressure pumps from falling behind on ethanol blends.
What it is
Charge-pipe injection running off the low-pressure supply to supplement the fuel system on E30–E50 mixes, so the high-pressure pumps can keep up. Options include a fail-safe box or a standalone controller; it pairs with a flex-fuel kit for ethanol monitoring and wants an intercooler with a post-intercooler bung.
Options
Pick your Controller in the configurator. With fail-safe box is the entry control option — it manages the supplemental injection and keeps it within limits. With standalone controller steps up to a full standalone controller, the higher-tier choice for builds wanting dedicated control over the charge-pipe fueling.
Where it fits in the build
Supplemental fueling for ethanol-blend S63TU/N63TU builds whose high-pressure pumps are the limit. We tune the engine to the fuel system.
Fitment
S63TU / N63TU (F-chassis) — F10 M5 & 550i, F06/F12/F13 M6 & 650i. Confirm your chassis in the selector.
Sourcing fueling with the tune? The Fueling Kit — S63 bundles the matched parts + calibration for 8% under à la carte.