If you want some good reading while you wait for a reply, search VNT here and on the diesel forum, as well as other 603-related threads.

Also for your car, do you know which head casting you have (603 xxx YY zz where YY is the head casting number)? If it is a 14 (search "14 head") you should be cautious as it is known for failures between the combustion chamber and the water jacket, higher pressures and temperatures will put it more at risk.

Currently the simple mods are a 55-trim turbo and IP tuning, reputedly can give you a few more ponies (55-trim turbo has several sources including the SDL from '90 up). Be sure that you don't have the trap-ox on the car, that'll lose a couple of hp. The IP is expected to have another ~50hp in it with enough air and tuning, beyond that you're going to be looking into larger elements (search Myna).

Probably a VNT, turning up the pump, an aftercooler, and possibly exhaust will be a nice upgrade to near 200 crankshaft HP.

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