We bought this 06 WRX about 2 years ago with 68k on the clock iirc. A month later the stock turbo seized up unexpectedly. Instead of putting another stock turbo in we decided to upgrade to the new Blouch 20G-XT. We had to keep the boost low to conserve the glass box as long as possible. We went with a Turbo XS FMIC, Walbro 255, 740CC injectors, turbosmart MBC and a Cobb SRI. With that combo on 17.5psi we put down 345/334.
Last November the transmission finally grenaded itself and we put in a set of PPG gears. We went back to get retuned and made 345/345 with 4.7v on the MAF. I didn't want to risk throwing codes so I went to autozone and picked up a 3" MAF housing and new air filter to hook up to it. We went back and made 383/365 on 20psi of boost on the 100% stock motor. We decided to play it safe and stay at 20psi until we decide to go with a forged set up. The car hasn't seen the 1/4 mile track yet but I'm looking to take it to Atco soon to get some numbers. As of now we only have an ACT "stage 1" clutch or something wimpy like that so I don't think I'll be able to get a good launch but I'll certainly try.
To give you an idea of how fast the car is, I did have a short roll race on the way home from the dyno vs my GTO and I gave my wife the hit to build boost. As soon as I heard her spool I went WOT, she actually pulled on me to the top of her third gear and then she shifted and I pulled ahead and hung there until we both shut down around 110 or so.