Cats for S.V.A.

[kenmorton]

The donor car I have used was a '94 year model so I thouight I wouldn't need to fit a cat but it now seems as though I might have to as the car was originaly fitted with one.
So does anyone know if there might be a dodge around this requirement.
If not are there any catalists available that are very low back pressure which wont affect the power too much.