This is probably a stupid question. Why do I see some 2nd gens around that shoot fire out of the exhaust pipes? What would cause this? Wouldn't it be backfiring? If not would it be bad for the engine or exhaust? How would I get my car to do this?

 

Click on search in the top left corner. Look for the key work "flames" or "shoot flames." I am sure you will find alot.