Hi Voucht, My donor has got a Kat on it.

have alook at this on www.ebay.de or the link below

300586962039
Artikelmerkmale - Automobile

http://cgi.ebay.de/ws/eBayISAPI.dll?...=STRK:MEWAX:IT

Thank you John, it is very useful to me.
The Sierra at 1€ looks great on ebay.de, unfortunately I can't buy the donor car now (need to modify my garage first), it is a bit too far, and have you noticed : it is an automatic gearbox. But thanks anyway.
So I know thanks to you that I should be able to find a Sierra SOHC 2.0i from after 1990, and catalyst have been compulsory in Sweden since 1989, so the car will have one for sure.
Thanks !