I've just been and bought a new cat for my old 1993 5 cylinder 2.3 audi cabriolet, it already had a new one only 2 years ago but now needs a new one again I guess that's the problem with cheap Chinese pattern parts.

Does anyone know how much roughly I should pay to fit the new cat, I would of had ago myself but don't have access to a ramp or pit.

The lambda won't be in the cat it'll be in the downpipe in front of it so you shouldn't have an issue with that. You could do it yourself in about an hour or take it to a tyre/exhaust place who will charge about £50 to do it.