Thanks for the info.
2006 328i Sedan.
ended up just unbolting everything and disconnecting the harnesses which made it easier to get the battery in and out. Replaced it using a interstate white bottom w/ green top 94R. it started right up. now off to the local performance shop to get it registered.
His: '08 Tundra Double Cab SR5 5.7
Hers: '07 - 328i