Say I wanted to achieve a 170-180mph top speed in a SC400. Is it possible? I mean I will have a an R154, 1UZ( Stock rev limit 6300rpm), ANd I am undecided on whether to keep stock 3.9 gears and and LSD, Supra 4.27 will make me lose top end or Supra 3.2(Not Sure) a lose some quater mile quickness...