Re: 166 3.2 Ti springs part numbers?
I can recommend the Bilstein B6 damper, if you go for the Eibach spring, though, I think that you will be lowering your car by 30mm.
I find the ride quality on my car (Bilstein+standard Super springs) quite good, but just too much pitching and vertical movement of the body, which means that it cannot be trusted on B-roads at speed.
I'm not sure why the springs are tired (or even if they are) but I have never owned a car with such short-lived suspension components.
The car has covered only 44,000 miles, and has required new dampers, front upper and lower wishbones, TR ends, top mounts, needs a new ARB, and probably needs new bushes in the rear suspension, too.
Apparently, the early Magneti Marelli dampers were knackered in no time at all, so maybe the springs had a quality control issue too?