Z1OwnersClub GB

Hi,Been cleaning up the a4 and noticed some rust on the fins of the exhaust collars.Tried cleaning up but no joy.Was wondering what the finish is ? Can they be re plated/chromed .One of them is badly pitted and the finish looks to have flaked off.A new set from Z Power is £80 .Any assistance appreciated

they are badly chrome plated to get them re chromed it would cost more than £80 z power are asking for a new set

Thank you ,much appreciated