Be sure there isn't a fuel leak that you may be mistaken for it coming out the exhaust pipe. Is it there when the car is off? IF it is still there, It may burning exceptionally rich (which I doubt), or there may be a misfire and the fuel in a couple cylinders are not burning at all.
http://www.autozone.com/servlet/UiBroker?UseCase=S001&UserAction=viewSimpleDiagInfo&Parameters=info
A device called the heat riser has stuck or the heat riser hose has fallen off. could this loose part cause a metal raddling when you start to excelerate?
yes nd it will also give of a oily smell with it
The burning smell from the exhaust pipe may be caused from oil or transmission fluid leaking into the exhaust pipe. For example, if your turbo is failing on the car, then that can cause leakage from the manifold into the exhaust pipe. There may be other reasons, too, which other people will be better articulating.
your catayltic converter is bad and needs to replaced
There might be a hole in the silencer boxes.
Smell the oil, if smells like some gas is in it. then it would be ur fuel pressure regulator.
nuthing
The smell of antifreeze is very strong and distinct, it does not take much of a leak to smell it. The radiator could still be full and have a small leak. I would check for antifreeze dripping onto the exhaust or on the engine block because when it is hot the smell is much more noticeable from the fumes.
Exhaust of an engine is a gas.
Well if I had one with that problem I would look closer cause it is leaking on the exhaust somewhere.
I would start by checking any leaks in your exhaust and fuel filter area, if there is any leaks throughout the exhaust the smell of gasoline or exhaust may come through into the interior.
most likely you have a leak in the exhaust pipes or a bad catalytic converter