It's time to replace the 5 year old battery in the 2017 Shelby GT 350. Last fall started getting pop ups about the battery not having enough power to maintain the computer function after sitting for maybe 2 weeks. Never happened before. The OEM battery is a 99r and it is awful small for a V-8 only 470 cca. Other 2017 Mustangs take a 96r battery which is 7/8" longer but width and height are the same. Also, the 96r has 540cca. Question: has anyone installed a 96r in a new GT350/ Any problems? Anyone installed an Optima or an Odyssey AGM battery. Your insights and experience with this matter would be appreciated.