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15-20 more hp isn't all that hard to get out of an engine.. upgrading the turbo is probably the last thing you'd want to do for that.
Start checking into the aftermarket. Less restrictive exhaust is a good start.. headers won't be an option since the turbo's in there, but everything cat back can be replaced. You can also look at new throttle bodies or intakes to try to cram more air into the cylinders.
The other option is to look for an aftermarket ECU chip. They'll use more aggressive timing, which can squeeze more power out of the engine as it is. The factory chips generally have conservative settings, with the theory being that the engine will last longer like that. Between those three modifications you should be able to get at least 15 hp more than you have already. If you do end up swapping the turbo, make sure you look into all the details first. I'd suggest checking online for a Saab forum... there's probably one out there and they'll be able to give you advice specific to your model, which I can't do.
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I wake up in the morning more tired than before I slept
I get through cryin' and I'm sadder than before I wept
I get through thinkin' now, and the thoughts have left my head
I get through speakin' and I can't remember, not a word that I said
- Ben Harper, Show Me A Little Shame
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