I am about to purchase a 1987 GN. I have two I am looking at (not set on these two, just what I have found worth purchasing on $17K budget) 1. all stock, all options 75,000 mi. excellent condition 2. lots of bolt ons, all motor and trans seals replaced, dyno proven hp, 35000 mi., excellent condition. Both cars check out with no problems on carfax. I know its my decision on stock v performance bolt on car... any more details I am missing? I do not know history of common problems to look for w GNs. ANY help/opinions would be very appreciated. Also open to any more cars for sale. Thanks, Bill