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If anyone else gets a CEL after installing Fabspeed pipes or removing cats some other way, I found a fix. After reading a little bit, I tried installing spark plug de-foulers on the second set of O2's and it worked. You have to buy (4) 18mm inserts (can get them at any local auto parts store for a few bucks). Drill out 2 of them so the O2 sensor head will fit, then screw those into the second set so it brings the sensor out of the stream and limits the exhaust sample. Been driving it all week and the CEL has not come back on.
***Sorry to nab your post Chris, just figured this might help being that it's a relatd topic***
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