I'm considering (nowhere near commited) to doing a custom turbo setup for my '99 L Wagon. It has an EJ22 and AWD.

I'm just looking for opinions at the moment from people who have experience. I know I'm going to have to get up/downpipes and new exhaust manifolds and piping. I'm not really looking to pump alot of boost, probably around 6-7psi. I want to try and get the hp/torque around 200 each.

Should I look for a junker WRX turbo, or go with a brand new one? Am I going to have to upgrade any internals? Transmission (It's currently a 5-speed, not sure on the tranny code)/Transfer Case/Differentials? Will I have to get a custom cam? Bigger injectors/fuel rail/fuel pump? ECM reprogramming?

I'm also thinking about building up a EJ25 for it, then just doing a swap.

So, anyone here who has actually gone about this before.. can I get any tips/problems/etc you guys delt with?