I asked about the BOV and how he had it set... this is the response I got:
"glad to answer any of your questions. your answer to the boost controller question is just a simple matter of time.Originally my uncle intended to have WAY more done than expected. Xccelleration said that he planned on coming back with the WRX to even further his plans up the horsepower chain. But time i guess had a different idea because my uncle moves around alot because of his job. And because Xccelleration started the build on it in 2002(when it first came out) there were no EBC's on the market just yet for the new car. So they put the manuel BC in and used the boost gauge in reference to the pressure reading and set it just a bit higher. In reference to the clogged cats they wanted to eliminate any concern about catylytic converters clogging because of the somewhat rich state between shifts(It does sometimes backfire between shifts like your mr2). So they took out the cats and supplemented it with high flow version that was still street legal. Im not sure why Xccelleration says no CEL's on there website. The only two that ever pops up is the p420 code which is"Catylitic converter effeciancy below threshold". It only shows up on long trips. But this is only due to the fact that it has the one high flow cat. It had 3 on it stock. I have invested in a scan tool and whenever it rarely pops up, i just delete it. A quick trip to any Tune shop can set the ECU to know the codes. The other is because It has an extremely light flywheel and upon contacting Xccelleration they stated that the car sometimes throws false engine misfire codes because of it. Everything runs fine but again, i just take out my scan tool and delete it when it rarely shows up. If your that concerned about it i believe that the TurboXS ECU on the car has the proper ability to take care of the lights. The car was set at 15psi when you were driving it. The boost comes on fully at 3000k under load. The reason for this is the piping diameter used on the WRX is large. 3inch intake, 4inch downpupe, 3inch exhaust, these mods were meant for higher top end. The BOV i have on the car is set to full atmospheric but its is a GFB Hybrid BOV ver.1. It was there first model for that type of design. They have many updated hybrids now. But you can set the one i have on the car between Full atmosphere, 50% Atm.50% Rec., and Full Rec."