Have had the exhaust modified on my Gt. The Cat box has been taken out and a new boom box has been built and installed. The result is very satisfying...the sound is not obtrusive..it has a deeper tone and a very nice rumble on decel. We retained the look of the stock setup which i wanted as Triumph have made a nice job with that look in my opinion...the outlet pipes are now one pipe instead of one inside another.
All in all the engineers have been outstanding and i'm very happy with their work...their experience in exhaust building is extensive and it shows in the result.