Had mine done, cat back, at a place in Shrewsbury yesterday. I had a custom made stainless system, as quiet as they could make it. Driving home yesterday it was a little un lexus like, a bit of a grunt. I can live with it considering the price a lexus system would have cost me. It was £650 as they had to cut right back to one cat and sort out one sensor. The standard cat back would have been £600. Mark.