Hi i have a 2006 sedan and im trying to find a car audio battery for up front because i really dont have any room to add a second battery in the trunk due to having to put a wheel chair in there often that takes up most the room. Most the car audio batteries that i find are way to big. If anyone has any suggestions as to where i could find a battery that would fit up front id appreciate it. I am running a mtx thunder elite 4001d rated at 3800 watts rms and 2 sundown audio x 12s. Thx.