One of the Triumph forum guys brought his 675 and supplied a couple exhausts for testing. We settled on this Street 675 Arrow full system, based on it's quiet sound, heat reduction under the (rider's) tailsection, and output. Also installed was a BMC race air filter, which added a little over 1hp compared to the dirty stock filter, so take that into consideration when viewing this chart. After I zapped it enough times with Tuneboy, it ran pretty well and the gains were respectable.