Looks like this was done a few months back. Any updates on MPG gains with these changes? I am thinking about doing it to my F150, but given the time involved under the truck, and the fact that I'd need 3 sheets of coroplast @ $20 each, I dont want to take on the project without some idea of what to expect out of all that hard work. Thanks for the update!
Jeff I would highly recommend that you start a section at a time. The gains generally are the best starting with the front sections. I would underpan the engine compartment first. Come to good cooling solution then work back from there. The website autospeed has some good articles that include pictures of how the mercedes 320 handles engine cooling exhaust, its a good read and will give you valuable data. The handling of the engine cooling exhaust is critical to the performance of the bellypan. You might also consider spoilers. Take a good look at the underside of an insight. I looked at one last week. It seems honda tried to make the underside reasonably smooth and then used small tab spoilers to fix hot spots.
02 Saturn SL
for pics click the link below