I ate my words from my previous post above. I ended up getting another Optima Yellow Top battery because I need the CCA!!
I couldn't get either the Nimbus or the Magna battery to crank over my engine! Got a new Optima and woohoo no problem.
This time I upgraded to a 140A alternator, power cables, added extra earth wiring kit in the engine bay and wires in the back of the car, and invested in a CTek battery charger.
Bitch works first go everytime now