Second O2 bypass (after cat / catalytic converter delete)

[exodus]

Originally posted by Brian.

Available at your local automotive store. Spark Plug Non Fouler PN 42009 ($4.99)





You now need to drill out 1 of the non foulers using a 1/2" drill bit. When finished this is what it will look like.



Side by Side comparision of the orignal and now modified non foulers



o2 Sensor inserted in the modified non fouler
http://i21.photobucket.com/albums/b273/ ... heat/9.jpg[/img]
Second, unmodified non fouler now installed on modified non fouler


Original non fouler->Modified non fouler->o2 sensor


Fully installed


The idea behind it is when you remove the cat the 2nd o2 sensor is going to have too much crap reaching the sensor that isnt filtered out, which will make it think the cat has gone bad. What this does is it moves the o2 sensor further away so a limited amount of exhaust gets to the o2 sensor, it is a VERY little ammount that actually gets to the sensor but as long as it is considerably less than the primary o2 sensor then it wont cause a CEL.

from (http://www.k-series.com/forum/showthread.php?t=8833) pics rehosted by me incase the thread/pics disappear.

[Melveo]

you need an anti fouler. it will hold the CEL light off long enough for monitors to set and to pass emission inspection. only a few bucks and need to be drilled out to fit the o2. anti fouler restricts the amount of exhaust flow the o2 can read. Ive been doing mines like that for 2 years now. my cat is gutted and im full straight pipe