I am new here and very new to Subies, the closest thing i have ever owned with a turbo was a 87 Audi 5000cs. great car! I bought a stock 02 wrx wagon two weeks ago with 80000k. It was kind of a spur of the moment buy, so i had not done my research, and went and bought a CAI first thing, i mean before i even registered the thing. The car ran great on my way to buy the intake, ran great after i bought the intake, for about 30 miles. then bam, it started sputtering, back firing, and NO power and low boost And the CEL came on with the dreaded p0171 code. So i did my research then and found out how bad the CAI was, so i lost it and put the stock intake back on minus the snorkus. I did all this with in 24 hours of owning the car. Car still ran like S***, and CEL was still on. When i say ran like S*** i mean no power, stumbling, and misfiring. so so i went a friend with a Cobb AP and he turned off the light. (at this point i didnt know anything about the hard reset.) I went and had it inspected before things got any worse and with the light being turned off by the cobb, i passed. Then i learned about the hard reset from CLUBWRX and did it. Wow this car is fast, i mean boom fast, everything worked great. I was hitting 13psi, no stumbling, no back firing. Drove the car for about 4 miles home, went to bed. Next day a buddy gave me a cat back magnaflow and my mech put it on. still no problems. car running great. then about 2 days later, car wont go above 6 or so psi. eveything running smooth at low RPMs would never know there was a prob until you punch it. Leak?? no checked it all. Waste gate stuck? no checked it 3 times. SO last night i just want to see if maybe i was missing a leak so i re set the ECU again, and bam, 13 psi rocket ship again. awesome. Car is so much fun. BUT after 9 miles. back to 6psi, slow as a civic. SOOO Bummed. my point is if it was a leak i wouldnt have gotten those 9 miles of bliss. or if it was the waste gate again i wouldnt have gotten those 9 miles of awesomeness. Again the car runs great. smooth idle, nice in any gear at low RPMs. the only time you know something is bad is when the turbo tries to kick in and it only get up to .04 on the factory gauge. It feels like a all motor car. no real pull. Not planing any more mods and i dont think the cat back is to blame or to much to ask for. Thinking it might be a comp prob but again this is my first wrx and i don't know these cars. So far i have cleaned the MAF, put in fuel injector cleaner, and i am doing the plugs 2mrw. any body got any advice on what to try next. i hate to beat a dead horse, but though there are similar stories on here every ones cars have so many mods you can never really tell what their prob is. This car has never been moded. NEED MY NEXT STEP.