Why not do something different like dark grey or maybe a titanium or silver? With your darker color ride I dont think anyone will notice the red vs flat black.
My SVT rear is all white, and when it comes time to paint it again, all the grooves and "Contours" that go into outlining this area are gonna get ground down smooth. A while back there were some pics floating around of someone who filled the lower rear grill in. Looked good IMO, but to each his own.