i was originally going to get the oem bass kit, but realized a set of components in the front and rear deck would most likely sound better and cost just as much. I am looking into Kenwood KFC in both the front and rear. My question is how big is the rear openings, i know the fronts can accomodate 6.5 inch speakers, and if i neded to make a bracket out of mdf i could, but i want to know if i can put 6.5 or 5.25 in the rear deck. By the way i have the 4 door civic ex with navi if it helps any.