Front end airflow...

I haven't spent much time under "BLUBYU" yet but I know C5s are "bottom breathers" like the C4s, C6s and I believe the C7s. The C5 front bumper openings where the fog lights reside are blocked off, even on the Z06s. I've wondered what benefit, or detriment, there would be to opening up those spaces, partially or completely, to get more airflow to the air filter and moving more air thru the engine compartment to keep it cooler. I've seen air intake setups that use those spaces in the bumper. Just curious.

Yep - the air dam is still in place and is in good shape. The openings for both the front brake ducts are functional but don't have a screen on them. The Z06s have screens over the fog light openings even tho' they're not functional openings. Don't understand that thinking. 🙄

Dan, from what I know about C5 airflow you are correct that the air dam directs air to, and thru, the radiator into the engine compartment. But from what I understand the air dam does not direct any air into the space behind the bumper where the intake air filter box is located. Air in that space I believe comes forward from the engine compartment over the top of the radiator so that air would be pre-heated from passing thru the radiator and the ambient temp of the engine compartment. And to my understanding, sucking warm air into the intake reduces horsepower potential.

Most "cold air" intake systems that I have seen replace the stock air box with a freer flowing set-up but they still suck in the same warm air in that space. There is one in particular tho' that replace the bumper grill block-offs and plumbs air directly into the intake, effectively becoming a "ram air" type set-up. I've also seen a modification where the stock air box is opened up and a hole is cut in the plate that directs air to the radiator. That modification allows cooler air into the space behind the bumper but it also would take some air volume away from going to the radiator.

If more outside air was allowed to enter directly into the space behind the bumper that cooler air would be sucked into the air filter/intake and excess air would go up-n-over the radiator into the engine compartment, which would lower the ambient temperature in there. From my perspective, a cooler engine compartment is better. I have read where the LS1 was designed to run hotter but when I see engine temps above 230 when driving slowly or stuck in traffic I instinctively start to worry.