David Banner

Get Like Me The Greatest Story Ever Told
The term "stuntin'" is a euphemism for showing off your wealth in the form of money, cars, expensive clothes, etc. David Banner appears to have "stunted" so much that it has become a habit for him.
Fightgar14
Get Like Me The Greatest Story Ever Told
carats (as in a way to measure the purity of gold, such as 24 carat gold) sounds like carrots, so he's saying the gold he has is not fake, it's as real as a rabbit (which is a real animal)
bill
Get Like Me The Greatest Story Ever Told
this is talking about a car modified so the computer that controls the engine has a custom-programmed chip in it that will tune it to probably be faster and less fuel-efficient, and it apparently has 26-inch wheels (bigger than standard size)
bill
Get Like Me The Greatest Story Ever Told
Chevy is a brand of car, and butterfly doors mean the doors were modified so that instead of opening normally with hinges at the side and swinging out, they have hinges at the side or top and swing up (which looks like a butterfly's wings)
bill