For the CEL's you can uncheck them in Enginuity under Diagnostic codes. Just find the one that throws and disable it.
You can try the XPT stage 2 map from http://plasmatize.com/osecuroms/index.php
. It is a tuner map really. Boost is pretty low and the tables have been smoothed but thats about it.
I have a stage 2 map I made for my WRX, same year, but I am not confident enough in it to hand it out yet. After a bit more tuning I might but for now, its gonna stay on my Laptop. Plus it is really a 93+ octane map right now as the tables can be aggressive in spots. I am taking it to the Strip tonight so I will have a real world report as to how well it worked.
On a side note, if anyone has any stage 2 tuned maps, not copyrighted ones, but self or open tune, I'd love to make some comparisons between them and mine. So far I feel that the EM tune has without a doubt given me the most bang for the buck of any Mod I have done.
As I have stated before, this should be the most popular forum.