A narrow splitter will stiffen the edge. Decide if you want that. Flexible or brittle?
Wider ones will produce downforce. Decide if you want that. Handling or economy?
Some airdams have a notch in the center to cause a jet of air down the center while shrouding the wheels. Gasoline Fumes has an extreme example.
edit: what I'm talking about
:
http://ecomodder.com/forum/showthrea...tml#post551905
Hey, it's in your thread.