Hey guys! I know that you can upgrade to a bigger alternator from a newer Mustang. Can anyone tell me the year and does it matter from a V6 or V8? Are there any modifications I would have to do to fit this into my 1991 LX? Also, I have read that you need to change your TFI module every so many miles. What are the signs of a bad TFI module? Thanks in advance guys. Y'all rock!!