Your in a wagon who cares for weight loss. Rip out your high flow vq and send it to me. That should save you a good 300 kg, take off your wheels and stick it up on blocks that will save you 100kg give or take. Take out your r35 gtr seats, bc's and swaybars and that should save another 50kg .So that will make you about 250 kg heavier than the 180 but you wont be moving far....