I've done my exhaust mod at 'Torqueflow' in Birmingham yesterday and everything was fantastic.
Guys there put a lot of effort onto all the work they do, very high-standard level of work done. They also give a lot of attention to the customer, making sure they understand what the customer wants. They have their own philosophy to the work they do, they are proud of what they do(they should be) and the price is very reasonable considering the effort they put in to both work and customers.
The reason I chose this shop was because I read only positive review on torqueflow on the internet. Others, they always have a few (or thousands) negative reviews..
It was right choice to go there and get my exhaust done as I am very happy now.
The shop was featured in many megazines before including the BMW megazine, specifically on the 840ci full exhaust system.
Here's link to my exhaust mod - Johnky's Project
They really know what they are doing.
Highly recommended for exhaust mods.