Frank , They actually Dont really work.
Here is a Pict. of my First 2 trucks , Click to enlarge.
for over 400,000 millage we looked for any evidence that this is a good investment , its not , unless you like the way your truck look.
it will actually suck the bugs right back to the hood , and we did not see any different as to how many bugs we need to clean from the wind shield.
we think that the truck air flow is deferred with the bug shield on.
especially with side wind ,as we can feal the front end ruddel ,
then we took the shield and install it in the other truck ,and guess what ?...we swap trucks all the times ,so we can tell the diffrant .
now i know this is not the rezone you are asking your question ,just wanted to share my experience.
Moose.