hey all just want feed back has any one heard or read about the legal stuff behind tinning the under side of the car to make it all straight for example like the guys in nascar do to help with down force.

hmm cant see there being too much of a problem

mates old man has some crappy vw and it has an under tray that pretty much covers the whole undercarriage....

but unless your going for a land speed record the question is why bother?

On a daily driver? Why? Wouldn't that make your car heavier? Less fuel consumption and the like?

I should do this... and make everyone look under my car to admire my good work.

Errrrrr.

Why bother?

on the highway it would make a difference, auto speed did tests by covering the underneith of the engine bay on a prius, fuel consumption dropped, so the whole thing I'd be thinking a bit more of a gain, then you can have a rear diffuser to again help areodynimacs and it would actually be doing something