No, No, NO.......
[MENTION=948]MekstingerGT[/MENTION], have you already signed up with Kia and purchased your car?
If so, when you send extra money it will simply apply towards your upcoming payments. That's the way they all work. You contracted for a certain payment for the term so the payment will NOT change.
You can, however, sent $100 less per month if you'd like because you have payed so far ahead. That's what my wife and I do because of my roller coaster income in the car business.