An adjustable aerodynamic splitter for a motor vehicle having a rearward flexible segment for attachment to the vehicle body and a forward more rigid segment, wherein the forward segment's leading edge is arranged for selectively attaching thereto an extension strip of a desired width, and at least one pair of adjustable length linkages attaching the splitter to the vehicle body near the leading edge, spaced symmetrically about the vehicle centerline, and arranged to raise or lower the leading edge in response to adjustment of the linkages' length.