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Discussion Starter · #1 ·
Hey guys (and girls) I do all my own exhaust work on all my vehicles and I was wondering if just deleting the second cat would set the CEL ... There's no o2 sensor after the second cat of I remember correctly but someone told me hat it would still set the CEL somehow .. Thanks in advance
 

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Discussion Starter · #3 ·
I'm planning on doing a tune eventually but I don't want a CEL in the meantime .. If I could get a bit of free power would be great but mostly looking for the right sound at the moment
 

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It will through p0420: CAT not Blazing (Catalyst System Low Efficiency)

You will need to disable it via tuning software, or stare at the CEL when it gets cold...
 

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You can remove the second cat without setting a CEL, as it is NOT monitored. Only the front cat is monitored. You won't gain any power by removing it though, especially with a stock tune.
 
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