I've had some similar lucky experiences to Mr Ron, including riding around Colombia for 3 months with no import documents. However, from what I recall about that border, they are quite hot on exiting imported vehicles and I think it is unlikely you will be allowed to leave without being stopped. I would expect, though, that they are likely to be open to "regalitos". Dunno, but good luck anyway.
How much does a man live, after all?
Does he live a thousand days, or one only?
For a week, or several centuries?
How long does a man spend dying?
What does it mean to say “forever”? - Pablo Neruda