if your referring to all top gears id have to disagree with that statement, topgear in basingstoke did mine, the quality was shocking. i had to go back 3 times to get it fixed. and it rusted really badly.
i had mine done at the basingstoke branch was a disgrace, if it wasnt blowing then the hangers where snapping leaving the exhaust hanging on the floor must have been back there about 7/8 times last time i do that!!!!!!!!!!!