Just thought I would share my experience.
Got a quote on the phone to take out cat and replace with silencer. Install a 2 box system after that (3 silencers in total, as I wanted a standard noise) £399. Wasn't the cheapest or most expensive quote I had, so I booked it in.
On the day I was advised I would only need 2 silencers, as it would be quiet enough so a 2 box system was made up and fitted. I was still charged £399, but saw past that. On the way home it became apparent the exhaust was very loud and embarrassing to drive through a built up area. So I booked it in to have a 3rd silencer fitted in the middle. That was done and they agreed it was too loud before. After hearing a noise when I went over a bump on a corner,I got it on axle stands and inspected underneath. The new, middle box was touching the floorpan on one side and about 3cm from the otherside. Booked in again the sort it out. It was leavered across and tightened up again, which moved it about 2mm.
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Saying that wasn't good enough and still too close, they agreed to fettle the exhaust properly, but I had to leave it with them. When that was done, they explained they had to take it apart and bend the pipe more. I asked if they , cleaned up the joint to remove the old exhaust paste to get a proper seal, but they said just a smear would be enough to reseal it and it wouldn't blow. 2 days later guess what, yes the joint was blowing. Booked it in again to sort. I stood there watching them do it to make sure it was done properly. Unfortunately i got home and now the rear tail pipe is now wonky. I really can not be bothered to go there again as in real terms the exhaust has cost , me £399 to buy and about £400-500 in time wasted/lost revenue (im self-employed)so £800-900 in total. Bargain!