I've been young and stupid. I've had loans that were over 50% of my income. I've managed. Would I recommend it to anyone? HELL NO! You are one BROKE ASS MOFO and you KNOW IT! The car just doesn't make you feel better about yourself in that circumstance...
I like keeping loans under 2-5%, my BRZ is about 4% right now but that's only for the 3 months I'm financing it for before I just pay it off.
Better to save a few years and get a new car without the debt over your head in my opinion.