Originally Posted by subiswag1
I bought a 03 wrx with Cobb intake and APS turboback. pretty similar situation that your in. it wasn't tuned so I bought AP and been driving around stage 2 for a couple of months with no issues. I love my AP. I would suggest you do the same. the added power is awesome!
you still need to tune for the intake.......if you are running an OTS map, you need to fix that ASAP.
02-03's can get away without a tune with a DOWNPIPE, but an intake still requires the tune!