To answer your original question, it does not affect performance, the amount of hot air that could be drawn in through the holes vs. the volume of air coming from the open end of the duct at the grille is negligible. It is also before the airbox and therefore also before the MAF sensor, so air metering is not affected. If you are a engine dress up type, cosmetically it isn't perfect, but I would prioritize it with the "if I happen across one of these in my picking excursions category" and not with the "I must run right out and scavenge a replacement category"
I'll check my shelves this afternoon, I think I may even have one if you want. Cost of postage would cover it, about $5.50.
:wrench: