Just had two new CATs fitted to the Z4M after the originals were destroyed by a misfire and fuelling issue. After we got the cause sorted we ordered a new set of CATs from BMW. The first delay was two weeks, ETA moved back for no good reason, The second delay was another month, ETA moved back for no good reason. The third delay was ETA September, with no explanation! So we took the car to Tony Banks in Leeds and had two new sport CATs fabricated and fitted for £354 with the work completed in four hours. If you ever have a CAT problem I cannot recommend Tony highly enough. https://www.tonybanks.co.uk/ BMW on the other hand were completely useless.