Originally Posted by IA Performance
The only AP that will work on your car is: ap-sub-001.
^ this is false unless i am off base by the naming convention. ap-sub-001 is the version 1 ap that can not be unmarried from a car thro the device. There is a version 2 ap that can be used for 02-04 wrx and i believe it is called a ap-sub-002. Dont think a bad turbo will cause misfire. If compression is good then it is probably the tune or the flywheel. Do some research on that specific flywheel to see if others have had the same issue and if it is the cause i would suggest switching back to a heavier flywheel just because, personally, i would not want to delete misfire detection from my car.