Hi all, would just like to add my 2pth here...... the Dutch pipes are really good quality stainless steel - Flopsy, Lex, Tinny and PSO (to name but a few) are sporting these now and they look good and do the job perfectly. DGS has an aforementioned 'bit of bent pipe' (which was manufactured by Mark at a time when the stainless pipes were not available) which will soon be changed for one of the Dutch ones due to rusting and its starting to blow. Catalysts were not a legal UK requirement until 1993, so any car made before then does not have to undergo a cat test during the annual MOT. Remember that most of the cats on our cars are over 22yrs old now and as many DeLoreans havent seen much use and get laid up for a long period of time, it is not surprising that the cats are now breaking up and failing. The normal life span of a catalyst in a modern car is about 5-6 years, but they have to warm up to be effective which can sometimes take up to 10 miles. In my days at Vauxhall, we had low mileage (under 20k) Corsa's with cats needing replacing at less then 3yrs old as they were failing due to lack of use, whereas the high milers like ex-company Cavaliers and Vectras were still on their original cats at 150,000 miles + (Daves Cavalier still on original catalyst with 158,000 on clock). Bye for now, Claire #2292 'Flopsy'