Surprising as it may seem, the area from just behind the rear suspension to the lower edge of the rear bumper REALLY IS an area with very confused air flow. In order to set the land speed records that I hold, I have installed an aluminium belly pan. The front part seals all the area on both sides around the wheels; the next part runs from pinch seam to pinch seam and back to the rear suspension. Before I go back to Maxton, I'll install the panel to fill in the back. The aluminium 'vents' shown in the ebay blurb are not what's being offered for an LS and you can't tell from the pictures what it really looks like. It might actually help.
KenS from Ben's Place