If it's not the turbo model I can't help you much. I'm sure there are volvo forums which you can log on to and find a lot of info. These motors are pretty rugged and i'm pretty sure you'll be able to find some performance parts for it.
i have a 1996/7 ( im not sure) volvo 850 not turbo model or station wagon. i was wondering if it was possible to put in a turbo in it , maybe from a 850 model that came with a turbo. also i was wondering what kind of performance parts i could possible buy my the Volvo, i was looking at ecu and im not sure what i should get. any help or experience in upgrading a Volvo 850 would be great.