As much as I liked the look of the K7 and K8 exhaust, it was very heavy. Mine had a rust hole patched with a beer can and duct tape. The exhaust would rattle from the loose, rusted baffles inside. After seeing many favorable posts about Delkevic, we got one. The bike lost at least 30 lbs. My butt dyno tells me I picked up some oomph. The sound is great. Installation was quick and easy.