I guess they dont make headers for I-6's huh? well, if you, or someone you know is handy with a welder, you could order a 'make your own' header kit and jimmy rig one up for a straight six. plus it would give you some bragging rights!
check headman headers or clifford ,PAW might also have various listings on the 300 cid motors that come in the f-150's ,friend of mine has the flowmaster cat-back thunder series and it sure made a difference,good luck.
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