Scotts is the one I like the best. You can get mounting brakets for all your bikes and it takes like 2 seconds to transfer it to each one. You can also adjust it easy ont he fly. I'll include a link to a discription of it on kneedraggers.com. This one happens to be the one for the ZX-9R but the ZX-6R doesn't give the description or it didn't load atleast. They do carry the '03 ZX-6R damper though.
Hey Stathe 6R in addition the Scotts damper has a bunch of adjustments that are not possible with other dampers, for example the damping angle, the actual damping that can be changed on the fly with a knob and the high speed damping.
Check out their website, there you can download the manual.
I like it a lot, it's not intrusive and the adjustability is great. Specially in hot or cold weather. I haven't felt any head shake or threat there of, since I installed the damper. Before I installed it, I did feel some hesitation on the front wheel when coming out of a corner and hard on the throttle. Not anymore! Which gives me peace of mind.
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