YESDo I only need to add the transmission cooler to bring the tow capacity up to 5000 lbs?
This is the first I've heard of changing the middle grill. I have the 5,000 pound tow kit on my 2015 MDX (08L92-TZ5-200 + 06255-5J8-326) and was concerned I was missing the grille. So I did some research and found the accessory grille, Acura part number 71103-TZ6-A00. It appears to fit 2014-2106 MDXs.I'm not sure if the 2017 is the same, but earlier 3rd gen MDXs also required changing the front middle grill. This should have been done for the trailer hitch install (3500#) but I suspect most folks either don't know or don't bother. It is easiest to do when you install the transmission cooler. OTOH it would be easy enough to remove the plastic blocking the airflow on the sides with a Dremel instead of buying the part without the blockage and replacing.