I had a Suzuki SV650 with a stubby Beowulf stainless steel exhaust which sounded great.
So when I got my Aprilia Tuono 1000 I wasted no time in giving the people at Beowulf a call. They were very helpful in telling me to avoid the carbon cans (as the Aprilia would blow them up) and stick to the steel ones.
I ordered a pair of stubby oval cans with the optional carbon outlet (purely cosmetic) and shoved them on the bike when they arrived in a couple of days.
The cans sound amazing even with the baffles in and look great. Well worth a look for exhausts which don't cost the earth and look and sound just as good as the more expensive mainstream options. And they're British!