If you dont want to thunder off down the road getting to much attention, but still want a good sounding Triumph, have a look into the Staintunes,they have removable restrictors which you can pop out in three mins for a nice loud sound or have them in to tone them down a bit. i have them on my TBA and so do a few others here and we love them. they are first class pipes and will last the life of your Trumpy, made of 100% stainless steel and the workmanship is second to none. a bit more exspensive then some but worth every penny. have a peak at there web site and have a look.
loud Rating i would say, about same as thunderpipes with baffles out about the same as TOR with baffles in.
all the best with your hunting for the right pipes for you.
Herb