wire from the MAF to the ECU and run it through the AFC. Look at the car's harness where the AFC is wired in. All of the wires from the AFC should be tied in except for two. These two wires from the AFC connect to the cut MAF wire. If you remove the AFC, you have to reconnect this cut wire so that the ECU will receive the signal from the MAF. Go to Apexi's website and you can find a pinout of the ECU to show you which wire is the MAF wire.