Mike, my z is within 50 lbs of yours [i'm 180 lbs]. Ls1, t56, alum rad, 6 pt autopower cage, stock fuel tank with atl black box, factory glass all around, corbeau seats, sound deadening [factory] there, q45 diff, 17" wheels and disc brakes. f-r distribution is 49-51 and cross weights are within a percent of each other. So, what are you and I doing wrong with our z's?! They seem to be about 200-300 lbs heavier than the others here.