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Anti-foulers pull the sensor further out of the exact stream just slightly enough to hide the inefficiencies of the catalysts, or lack of them, that would normally trigger a mil code. Pulling sensor's too far out or removing them completely will trigger a mil code for oxygen sensor inactivity. The goal is to stay between both of those.
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-2006 Mustang GT convertible: intake, tuner, straight pipes, rollbar, blackout panel, front lip, and 20" wheels
-2003 Hyundai Tiburon GT: Eaton supercharger, Cobra exchanger, I/H/E, Apexi AFC
-2009 Mazda 6 GT: tinted windows and front signals, AutoExe springs, and Rotora BBK.
Vehicle: 2006 Mustang GT Premium Auto - Vista Blue
Location: Deep in the <3 of Tx
Posts: 2,851
Wow I didn't know about these non foulers. I may pick up a set just to have on hand in case one day I need them (probably not but you never know). I have Kooks LT w/ their high flow H. I've never heard of anyone having CEL issues w/ the Kooks setup though.
ya these were a bust on my 05. I put the non foulers in and loaded my stock tune and the CEL came back on after about 30 miles. Threw and o2 and cat code. Its throwing this even with hi flo cats. time to find a stock h pipe now damnit
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