Here's a pic of my front grill slots...they are very narrow as well. This is the slots with the foam pipe insulation in them. Total cost was $3 from Home Depot...probably saved me 10-15 mpg during my first 5 minutes of driving until my engine was up to temp.
http://ecomodder.com/forum/attachmen...9&d=1239040885
http://ecomodder.com/forum/attachmen...0&d=1239040885