Termi's are popular because the two brands are so oft associated with each other... almost like Termi's or nothing else. Have never been disappointed with Termignoni, but hear great reports from owners with other exhausts. Would let costs, appearance, performance considerations drive your decision.
FWIW, the Termi's on my '03 999 with included chip is the most seamless, perfectly matched performance exhaust system I've ever had on a twin sportbike. It cost $$$ but would get it again easily. It has the appearance (CF shroud), performance, and sound. The Ferraci system may have it as well, just have never seen it here in Colorado. A view of the Termi's on the 999...
