dont blame every one "seemed "to think the the 2780's were the duckguts nd while for a std bike with std exhaust they are fine and even if fitted to a bike fitted with better exhaust and ridden calmly they were good but I found I could hear them struggling to suck air at higher RPM's whilst fanging thru my local Mtn playground, the K&N RX 4040-1's solved this for me and I like the HotRod look of the filters sticking out, also before it is asked they do not bother my knee postioning