I've only got 10 on top (each bonnet), and none on the sides! But my "short louvres" have one distinct advantage - no water gets onto the plugs in the recess on top of the Zetec engine - a common problem it seems. All but 2 of the louvres are over the heater intake, and so effectively do not contribute to engine bay cooling. As a result an elongated raincover is not needed.
In the 4/4s produced shortly before the Sport was introduced, short top louvres with no side louvres was standard, and full louvres charged extra.
On the Roadsters with "innies" I fail to see how this can be nmore effective at drawing air than outies, as the air draw is due to pressure differences not shape of louvres. Looks cool though.
Nigel
