back fire
 

earlier today i was racing and i hit a bump and like 1 or 2 seconds later i heard a loud back fire and the person behind me saw it spit a small flame out the pipe. i am tryin to find out what can cause this. the car has light mods. it has a short ram intake, factory exhaust all the way back to the muffler which is a aftermarket muffler. i am not sure what kind of muffler it is but i can tell u that it is a straight through design with 2.5 inlet the muffler is oval shaped and the outlet is 4 inches and slanted i also have a port and polish and every thing else is stock. i cant remember the full engine code but it is a D15 16valve and it is automatic.