The $287 "enthusiast" version of Durametic limits the owner to a total of 3 VINs. Once a VIN is linked in it can't be removed. So unless you can find someone with the Pro version that doesn't limit the number of VINs or a particularly generous enthusiast package owner, you're probably SOL.
http://www.durametric.com/buyus.aspx
IMO, if you're in for the long haul with your car, it's well worth the $287 for your own setup. You'll find it to be a huge convenience and time saver, and very likely a money saver. If you only use it for your car, you'll certainly be able to recoup a lot of your investment if you sell the car.
BTW, I pickup up mine used (only 1 VIN registered) through craigslist for $175. Haven't had to use it yet, but it's nice to know it's there if/when I need it.
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