Think we need to post a sticky on this subject as it crops up about once a week!
According to the IVA emissions regs. a kit car built with a pre 1995 engine will NOT require a catalyst but as with the build of all kit cars you will need to provide proof of the age of the engine when submitting docs. for the IVA.
The donor car log book showing engine number is no longer accepted as proof of engine age.
Mass produced cars registered from August 1992 had to be fitted with a catalyst for sale in the UK and europe.
With the introduction of the IVA cars imported from outside the EU are required to have a catalyst fitted or re-fitted IF they were fitted with one originally. eg if I was to import my 1991 jap spec MX-5 now it would have to have a working cat fitted even though it was first used before the catalyst requirement in the EU.
To answer your original question if you're using a Sierra donor of any kind and using the donor engine then you will NOT need a catalyst.
If you are going to use the engine from another car ie not thr donor car engine then you need to make sure that engine is from a pre 1995 car and you have paperwork to confirm the engine age - contact ford with the engine and or chassis number and they should write back with the age of the engine which you can submit to the IVA.
HTH BV.
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