Air pressure difference between the heat at the manifold and the relative cold outside.
The manifold can get very hot, which increases pressure towards to outer, cooler, opening.
Also, the pressure of more exhaust gas being pump into the manifold from continued combustion from the engine.
Leaking valve cover gaskets would leak onto the exhaust pipes under the hood of the car.
There are many different types of exhaust pipes all with different reliabilities. The best type would be stainless steal exhaust pipes which do not rust and therefore last the longest. They are however the most expensive.
valve guides or valve guide seals or piston rings. in colder weather?
The head gasket is blown.
It could be objects shaking in the trunk or something loose on the rear license plate or a problem with the catalytic converter or exhaust pipes.
most likely you have a leak in the exhaust pipes or a bad catalytic converter
Yes, truck exhaust pipes were made for trucks and not cars.
I would be more worried about the foods I eat, do some research on msg! Accidents. Cigarettes and exhaust fumes take years to kill you; some accidents will kill you immediately.
exhaust leak or a possible fuel line leak
One reason would be exhaust fumes may enter the cabin area.
There are several reasons that can cause smoke two, out of the exhaust on your 1993 Chevrolet suburban. The most common reason is a dirty fuel injector.
Exhaust of an engine is a gas.