I heard somewhere the louvers were originally meant as a "GTi" trim option, but they reduced drag and also helped cool the engine, drawing air up through the engine compartment. Thus they were added as standard. Martin Rendy Cheng wrote: > Hi Phil, > I think it is called _louver_ (spelling?) Initially, there is no > louver. The rear vertical window is always there since the > prototype. I think the louver it is just an add on. > > rendy