Congrats OP.
I just refi'd through PenFed two days ago and was approved. I originally started with a 6.49% APR through the KIA dealership, then 4.49% through Chase Auto Finance, and now down to 1.49% via PenFed. I have also changed my payment terms with each decrease, originally it was a 72-month term, then a 48-month term, and now a 36-month term.
Starting Score: EQ 675 | TU 688 | EX 702