that right there is MC approved.
matches the under spoiler very well. gives it an aggressive look. i would do this to my 370 if i had one. i cant get over how much better that looks just by breaking up the front section colorwise. it looks like its supposed to be like that from the start.
id like to see this on the lighter silver with matching flat black sports package wheels!!!
but no way i would try it myself. ive F'ed up so many things trying to wet sand even little scratches out of my cars. but on my old nismo S-tune car i did sand and paint the center part of the grill where to tow hook goes flat black and it came out ok but the lines wernt 100% straight. so yours looks damn good for a DIY