a lot of the "racing" batteries are not of the same relative size and Amp Hour capacity as stock so can't be used in IT. relocation is totally out... the gel cell (optima) are the best commonly available answer to the question, and optima sells a size group 75/25 and 25 red top and 75/25 yellow top that fit the bill. for civics, they have a 51R (AKA 52) yellow top.