It does help flow more air through the side mount and its very easy to do. You might as well do it. I did it to mine before I got the Front mount. I just drilled a bunch of holes so it still had some sort of protection from road debris.

You can also follow this link (which I provided to you in the other thread you started) for a tip about the mesh grill.

Some would say that the area in front of the tire (and coincidentally, behind the SMIC) is an area of high pressure. Thus, they claim, trying to "relieve" some of that hot air that has pasted through the SMIC is pointless, because the high pressure area will decrease the possibility for the hot air to be more free-flowing.

It's an interesting observation, and there is certainly validity to their argument, but I think you'll be just fine with doing something similar to what I did.