well - when Smithy fitted it, one of the holders broke off which meant that the top arm on the back box wasn't connected.
Whilst driving up the M1 one day, the arm flew off

thus taking a piece of the back box with it producing the hole.
Got on the blower to Smithy and he rang Blue Flame - they asked for me to ring them, which i did. They told me that i would have to drive to Skelmersdale, let them take off the back box then have them determine who's fault it was!! I felt this was unacceptable (lifetime guarantee and all that) and got Smithy to ring them back. It ended by him saying that he would never buy another Blue Flame zorst!
I am happy with the exhaust but their customer service was sh1te