Do you have the MSP ecu? I know for a fact the P5 will run without a MAF in a seriously degraded mode. I know because when I trimmed some excess off my intake, we forgot to plug the IAT and the MAF back in, and it ran in 'limp' mode. We have that wonderful Mitsubishi MAP (Manifold Absolute Pressure) sensor as a backup / to work in tandem with the MAF.
And yes, his car wouldn't start at all until we got the pipe hooked back up.
And yes, his car wouldn't start at all until we got the pipe hooked back up.