Extra payments typically go to the principal. However I haven't heard anything about sending them to a different location. That dosent mean anything bad, I just dont know much about NMAC. Just make sure they are receiving the extra money and crediting your balance. You should have a number in your payment book or statement you can call to get that info. Anytime you can pay extra its a good thing to do!
89 Maxima Super Black SE 5 Speed
-Tokico Struts, H&R Springs, Highflow Cat, ST Front and Rear Sway Bars