I recently installed a S600 grill look on my C43. I noticed that the original front grill had plastic covers that aligns the air intake dams. Since the aftermarket grill I recently installed didn't have these plastic covers, I'm curious if it affects the performance. They are definitely OEM. I asked my mechanic and he said that I don't really need them and they're just their to prevent large objects from entering the air intakes. To me, it seems like the plastic deflectors help direct the air from the fans to the air intake. Any ideas of why there are plastic deflectors on the air intakes? I thought it would be better without them to get better intake, but I may be wrong. Any information would be helpful. Check your original front grill and you'll know what I'm talking about.