Bought a wrx for cheap but with issues....

[MainFrame]

I would Deff buy a Cobb sf intake and a Cobb accessport. Then I would do all the maintenance and flash to the stage 1 or 2 map once all is well and fixed. You'll be find with a fmic and bov.

Sent from my EVO

Map notes for the Cobb OTS maps specifically say what mods they can be used with, and neither a FMIC or BOV are compatible. Regardless, a protune will provide much better results, and probably cost less in the end.

[Donkey]

Ok p0420 is the cel code I'll check for the front o2 in a sec and it does have stock rear o2

The P0420 is for the rear O2. I doubt that car has been tuned for the mods.

[mycologist]

Or, in other words, if you put in the work you might have a great car for your effort, but it might not be the most economical approach.

We've all been there and done that - for me it was worth the learning experience.