most likely, too much fuel.
Heat, unburned gasses, carbon soot.
one, but you can get a double exhaust for it
The tail lights are interchangeable, the only difference is the chrome trim that was standard on the Caprice
If your referring to tail pipes, most high performance cars have 4. exhaust pipes? most cars are 1, performance cars have 2.
Old school we used dual pipes on for each side of the v-motors... now manufactures put dual tail pipes to control back pressure of the higher output smaller motors ... oh and dont forget the converters ...
By how much smoke you have blowing out your tail pipes.
Not if they are OEM tailpipes. If your changed them it is possible.
The AIR pump, pumps clean air into the burnt exhaust gasses that is in the exhaust system/pipes and cleans it up before it exits the tail pipe.
With the stock tail pipes the 96 marques' has 190 horse power and with the dual pipes you have 210 horse power
The engine is burning oil, there is no chemical solution only mechanical.
If you water is clean and tempered right it will!