I just put a new oem shortblock in my 04 wrx after it cracked a ring and blew up at 91k. I re shimmed the heads, replaced all seals,new clutch, timing belt, pretty much the works. So the engine is about as close to new as you can get. I now have 1300 miles on the new engine, and have it tuned stage 2 with a cobb ap. i have a turbo back exhaust, up pipe, perrin turbo inlet, and a lightweight crank pulley. The car runs awesome, but im craving more power now. Im thinking since I have a fresh engine to build off of, a turbo upgrade would be a good idea. I want to ditch my stock turbo asap because it has 91k miles on it and just makes me nervous. So my question is, what is a good cost effective turbo upgrade, that wouldnt make the car unreliable? Prefferebly one i could still get a cobb map for. Any info helps! Thanks guys.