Just bought a new cat to manifold fitting kit and a decat pipe and can not get it fitted as the sealing ring (flange) will not fit on the downpipe of my manifold its the proper Renault kit with the springs and cup washers etc. Also the ring I got with my decat does not fit the downpipe. Just wondering what others have done?? Had this problem with exhaust since I have owned and seriously contemplating on selling it now cz am sick of the car now 