I had Nitron’s fitted to my P4 at Williams over a year ago. Set up exactly to my preferences they transformed the ride quality of the car to the extent that even my wife noticed how much better the ride quality was. Testament indeed.
After picking my car up from service in early June the mechanic asked me if I had experienced a squeaking noise from the rear suspension as this had been reported by other owners after Nitron retrofit. I replied negative. However, since then and noticeable since we have been in France (currently still here) a very audible squeaking noise has developed from the rear of the car. Maybe the suspension or could be coincidence, but certainly irritating. So along with the perennial clonking driveshafts and water entry under the bulkhead all is going well! 🙄