You definitely need to invest in the 3M clear bra kit to minimize the daily road damage. I also recommend the Chrysler bra for road trips, mine has save my car from serious rocks and debris while we have been cruising down the interstate. The two little air dams do help direct some of the debris over the top of the car. However, I don't recommend using the Chrysler bra without the 3M underneath because dirt and moisture between the car and the bra will end up damaging your paint. Neither bra will save your paint or windshield when you exceed 140 mph then sand and dirt in the air ends up leaving small little slices in your paint where it's not covered and you end up with pits in your glass. The paint I was able to repair with factory touch up paint and the LANGKA 3 piece repair process, however, the windshield has small cloudy patches in direct sunlight. To avoid anymore damage I stay below 120 mph.