So I finally got my sct tuner and tuned up my mustang, worked great. Today I was changing back to the street tune and whenever it told me to turn on the car, it would die instantly. Did this every time. Went and got the battery tested and it was running 212 cold crank amps instead of 540 like it should, bad cell I guess. Anyways, I'm going to have to buy a new battery. Need one strong than OEM, anyone have suggestions?