my two chamber flowmaster and my cat get extremely hot glowing red, spitting flames one time. cat is almost brand new along with muffler and i can see through the screen so its not clogged. tranny fluid level is normal , but the exhaust exits out the back of the flowmaster so could it be i need to finish the exhaust to exit out the back? my engine is running rough am i possibly not firing on one piston and getting unburnt gas down in there ? 88 xj 4.0 does it at highway speeds up hill and crawling. thanks in advance for any ideas