Agree with R6s and dampers... tried mine without one for 2 sessions. Scary to say the least.

Having said that, just about all the bikes I've ridden would headshake over the crest of T3... even the Aprilia RS250!! I still have the lame-o standard damper on the ZX6R and I use it on one of its softest settings... you really don't need a LOT just a bit to keep things from getting out of shape too quickly. And to me the worst headshakes happen accelerating over the strips on the exit of some corners not on the crests.