Cats came in on the j plate 1993. The mot station will know the full spec of your engine date of engine manufacture etc as they use the dvla data base, which we have to provide the evidence of the engine age? No getting around it, some exhaust manufacturers do a seven style exhaust with a cat already built in, I am sure that vortex is one ? Cats aren't reallya legal requirement, trouble is, without one, you won't hit the emissions requirements.
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