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My wife and I did our first track day this fall. We were both on 2014 BMW's and the cost of our bikes was on my mind at all times. I would like to have a pair of track bikes that could share spare parts. A guy I work with want to join us and he's on board with the interchangeable parts idea. So, what are the differences between 1st gen/2nd gen and what are the model years of each? I'd prefer efi if possible. We can't actually buy any bikes until spring time but want to know what we're looking at when the time comes. There have been some good looking deals here on the for sale section but the budget didn't allow us to jump on any of them yet.