Subaru OEM MAF (02-07 WRX/STi)

The Subaru OEM MAF Sensor has to be in 100% proper working order for your vehicle to behave properly.  Ar you noticing any issues with fuel corrections and/or your tuner not being able to tune the car easily?  Are you getting any of the P0100-P0104 Codes?  Chances are your MAF needs replacing.