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Testpipe Non-Fowler Question, I bought the non fowlers from discount autoparts, same as the pic in

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Old 07-14-2006, 07:01 AM
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Default Testpipe Non-Fowler Question, I bought the non fowlers from discount autoparts, same as the pic in

Justin's Sig, Do you only need to install the rear one, or also the front one?
Old 07-14-2006, 07:02 AM
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Default just the rear.

installing the front will result in incorrect reading of the A/F mixture since the sensor is not directly in the flow.
Old 07-14-2006, 07:26 AM
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Default Fouler. Foul.

Has nothing to do with birds.
Old 07-14-2006, 07:29 AM
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Default rear only. that's the point of it. to pull the rear out of the stream of flow to trick the sensor

sure, it's a band-aid to the issue, but it works for me. no constant CEL

<img src="http://pictureposter.audiworld.com/10901/02_spark_plug_non_foulers.jpg">
Old 07-14-2006, 07:30 AM
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you screwed two off them together?
Old 07-14-2006, 07:32 AM
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Default it goes like this =>

drill a hole in one of them big enough so the sensor can be screwed into it, then screw another one on the one with the hole in it, then screw it into the exhaust.
Old 07-14-2006, 07:32 AM
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Default You stack them, drill the outer NF (one the O2 sensor screws into) out...

You need a 1/2" or 19/32" bit if you can find one!
Old 07-14-2006, 07:38 AM
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one more tool to buy
Old 07-14-2006, 12:17 PM
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just rear, it measures cat efficency... moving out of exhaust stream "tricks" it
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