Bill, shame your so far away from prospeed. I much prefer mine to my old BTB.
The fabrication is not as good, but its not made on a jig and will be done in three hours.
If you don't like the noise, charlie is more than happy to adapt it to your requirements. I went back twice to get it to my liking and charlie covered the costs.
Stick to 2 1/4" if you like it quiet on the motorway, 2 1/2" is very boomy in comparison.
Get a sports cat at the same time, the car feels much more torquey round town with one fitted, and will still pass an mot.
The BTB was very well fabricated, but i was astonished at the weight, and i really didn't like it between 65-75mph on the commute.
The prospeed and sports cat made the car feel much better, i did not feel any improvement with the standard cat and the btb fitted.
When i fitted the BTB, i really missed my renault system after 10 miles on the motorway, around town and up/down the revs the BTB sounded nice, but at constant revs, it disturbed my brain.
Total cost was £400