QUOTE(loggyboy @ Jan 24 2008, 10:06 AM)

Most coilovers use 1.9 or 2.25 inch spring diameters. meaning you can swap them for off the shelf items.
Have a look at demon tweeks and other performance places for ideas. Your likely to need professional need help choosing them unless you already know the standard poundage ratings that the existing ones have but even then, without experience it would be a trial and error process, too soft and it will bottom out over bumps or sit too low at rest with the weight on them.
The bonus with adjustble suspension (either fully adjustable coilovers or fixed height with adjustable shocks) is you can soften and stifen the ride to a certain extent with just the shock absorbers, so even with the springs they come with, if the shocks can be tweeked, you should find a suitable compromise of ride comfort, ride height and handling.
I think D2s have bounce and rebound settings for shocks, meaning thats even more adjustablitly, but also can make it more complicated to set up.
I have since highered the rear up a few mm and it seems to be a bit better. I'll try to adjust the dampening to make it stiffer at the rear so it doesn't bottom out under load as much i hope