Re: 147 mot fail - what to do
Which cats need replacing, the twin cat on the downpipe or the mid cat? If its the mid cat it should cost around £140 plus fitting or if its the downpipe expect to pay £750 from a stealers.
I replace the whole exhaust new front to back and it only costed £800 with fitting, and that was with a CSC mid and back box. Lamba sensors shouldn't cost that much even on top of the quote. Get a few quotes from the budget places, kwik fit can supply Alfa original parts at a fraction of the dealer cost, I got my downpipe through them for £350 inc fitting and a part warranty, just goes to show that it pays to try it with the least expected.
I think you should get all the work done for less than £800 give or take a bit of perserverence.