I believe it was from an '07 gixxer 600. Yes, some modifications need to be made to the shock and the bike but nothing too dramatic.
Check out
this thread. It's definitely a worthwhile upgrade if you ride aggressively, or do a lot of 2-up riding.
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Don't do something because it's easy,.. Do it because it's not!
If you aren't going forward, then you're falling behind.
"Drive it like you stole it"!!!