I have a 2006 WRX with a 3" TBE and a stage 2 tune. I plan on getting a bigger turbo eventually. My question is what supporting mods will I HAVE to do and what turbo would be a relatively cheap one but will give me more power than the stock one. I would like (in theory) to make ever 300, how much over, doesn't matter. I was thinking of a VF39 only because Cobb has a map for it and I'm not in a location where there is a tuner near by to get it pro tuned.