2001-2002 Bentley EXP Speed 8

Images courtesy and copyright Bob Chapman @ Autosport Image
Text copyright Michael J. Fuller

Note the rear horizontal tail strake.  The horizontal plate acts as an extension of the diffuser, while the sharp edge generates a beneficial vortex that encourages air to fill in the base area at the back of the car.  Working in conjunction with the diffuser it helps draw more air through it.

©Copyright 2001, Michael J. Fuller