First Arizona Thread....

[XwChriswX]

Originally Posted by JoeZ

I think I will go with HFC instead seems to be a lot less cel issues that way. If I could find a garunteed way to not deal with that I really like the test pipe idea. I spent an hr talking to my mechanic last night he was all against it(he drives a modded350 and works for Porsche). I value his opinion and after our talk I came home scoured the threads and realized he was dead on with the problems that test pipes have. Grrrr. Oh well HFC's arent that much more.

Its mainly an issue with the positioning of the o2 sensor, most HFC's, Headers, and Test Pipes have an extended port to put the o2 sensor in so it picks up less of the gas flow. This is to prevent them throwing a CEL code. If it still does, I take medium thickness steel wool and pack a bit of it in front of the o2 sensor to block even more of the air flow from reaching the sensor. Worked like a champ in my tC.