I fitted the Remus Hypercone. Nice & light and a bit loud for me without the supplied baffle so I run it with. It makes a really nice sound. I would also recommend having the ECU re-flashed, it makes a huge difference in traffic. Also available in Matt black & Titanium. It also has a bracket which fits to the wheel-side of the can so no wrap-around strap which I personally prefer.
http://www.ukmonster.co.uk/monster/s...emus+hypercone
If you search Ducati Monster 1100 Evo Remus hypercone & click on images you will see examples fitted to black & red versions of the Monster