DENSO MAF sensor
 
Subaru motors
2.0L EJ205 / EJ255
2.5L EJ253
2.0L FB20 / FB25

DENSO 197400-5131 / 197-6130
Subaru 22680-AA38A

other part numbers
Delphi AF10345
Holstein 2MAF0118 
Pierburg 728342200
SMP MAS0317
Walker 245-1244
Wells 5S15408