i have apv2. local tuners will not provide unlocked maps..
i assumed i would have to get a tune but anyway..
2003 WRX stock 2.0. replaced uppipe, installed cobb turbo back, evo III 16g, id1000 injectors, walbro 255 pump, turboXS topmount, grimmspeed EBCS.
got access tuner race from cobb, installed wideband tuned for pump 93 and e85.
i assumed i would not be able to do this. i was wrong..
thing is you gotta read everything you can here and at rom raider. even though i went cobb, romraider has tons of good info. i bought a tactrix 2.0 cable and use romraider for some logging and monitoring.
once you read up you gotta go slow and pay attention to your AFR and slowly work you way up.
the tune i ended up with i am pleased. i top a 20psi and boost comes in around 3000 and maxes at 3500 in top 3rd gear.
im at a boundary though. i want to go hybrid with a better flowing heads. to do that i have to upgrade my tranny and then build out my motor and then tuning gets interesting with half-mafing or using a standalone.