I suspect there are many opinions on which performance exhaust can is the best upgrade for a Sprint ST. It would be used in the low position with panniers. I would value most, quality of construction, sound "not too loud", performance, appearance, origin "U.S. or Britain",weight advantage and cost/value. I've read good things about the Triumph CF cannister as well as the products of Wolf Racing, Arrow and Two Brothers. Also important is being able to install a "new tune" that works well with the exhaust and doesn't leave any flat spots. Cheers, Scott