When we consider that all the aftermarket exhausts are just straight through cans with no catalytic converters and intrisicate restrictions inside, at the end of the day the power you get from them depends on the diameter of the link pipes, the cans themselves and that of the outlets and even the inclination of the link pipes makes a difference, the more direct and less angled is the exhaust flow the higher will be the power response.

Oh and it makes absolute no difference if they are made of S/Steel, Carbon or Titanium, except for weight and looks.

Have you looked at our sponsored MTC Cans on this link: http://www.xt660.com/site/node/340