Hello everyone. I just got my stereo installed and the shop that did it recommended I upgrade to an Optima battery. I've been doing some research and it seems like a good move....but can't get any matching responses when I ask what SIZE battery it takes. Optima tells me I need the "BCI Group Size Battery" and one dealer tells me it's a "55" and the other says "35". I believe "35" to be correct but am looking for affirmation. 2ndly - has anyone installed an Optima Yellow Top in their STi? If so, were there difficulties encountered in terms of the +/- posts being in a diff't position than the stock battery? I've read that I may need to add some inches to the starter cable, which has me a little freaked out. Can anyone help on this/these issues? PLEASE?