I have 2 front and 2 rear new, unused coil springs for irs B20's which are stiffer and slightly shorter than standard.
These are a spare set I had made for my 3rd Series B20 which I successfully raced for many years and are to a spec provided by a well known retired B20 racer and also used today by the Kennedys.
The wire diameter is slightly increased from standard and the result is that the car sits slightly lower and the ride is slightly stiffer but not enough to make the ride uncomfortable on the road. The roadholding and ride on a circuit at speed is hugely improved by this modification.
£180 incl UK delivery.