Suzuki has been working with weight reduction in the last couple year models to keep with competition.... It wouldnt surprise me if they had a smiliar set up in the 06...Im pretty sure it is the 1k series only...comparisons done between my zx6 and my buddies 04zx10 , my bike was the more durable of the 2..I bet the 600 series could with stand twice the impact as the 1k series bikes... Good post im looking forward to reading others feed back on this...