The suspension on a factory coupe varied slightly depending on the VIN number. The early cars have stamped control arms, some have two piece uprights (wheel bearing housing and the strut tube are separate pieces), and no rear anti-roll bar. The late cars have the two piece uprights, cast control arms, and a small rear anti-roll bar. All as far as I know, use 125lb/in springs, or there about. The best suspension you can get on the MacPherson/Chapman strut suspended Audi's is to redesign them. That takes a lot of time, and can cost a fair amount if you can't do the design and fabrication work. I had a suspension from Vortrag installed on the car. The big thing about the Vortrag suspension is that the lower spring perch is removed, and a smaller perch that is adjustable for ride height is put on in its place. The upper perch is also modified for use with the smaller OD spring. The setup can use any spring rate you choose, and is smaller in diameter. This translates to anywhere from factory ride and clearance with quicker turn-in to no body roll at all. My car doubles the front spring rates, and more than doubles the rear to provide a reduced amount of body motion in all aspects. A slightly more harsh ride is the cost, but I feel it is well worth it. With a stiffer rear spring compared to the front, the chassis will have less understeer which is something that needs to be reduced on this chassis. Something that I have contemplated is getting a different upper mounting point. The factory uses a bonded rubber mount, which is good for comfort, but deflects under load. It also has no adjustment. One company has a spherical mount, that has castor and camber adjustments. The high cost makes it undesirable for many, including myself. I'll eventually design and build my own for use in the front and rear of the car (same upper mount). I'd also like to build lower weight and stronger control arms. That will also have to wait. Of more importance will be replacing the aging race-issue Hypercoils that have lost all of their coatings and started to rust. Granted, they say to replace their springs on a yearly basis on race cars, and mine saw nearly 5 years of street use. Its about time. I'll be increasing the spring rate front and rear, and try to get even more neutrality out of the chassis.