i have made some enquires and the later coil springs and shockabsorbers can be fitted to the earlier cars, if you ring or email your dealer or specialist including the last six digits of the chassis number, they will be able to advise you as to what year you go up too,
Rick - thanks for the advise - I'll go and test drive a new one and see if the improvement is worth the bill.Do you know if new software would be needed as well ?