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I'm about to mod my 09 2.4L ecotec and planning to delete the muffler, install a thrush 18" glasspack and elbow pipe to connect the pipes. Will the check engine light turn on from deleting or modifying the muffler?
 

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considering that your rear o2 sensor basically is just there to tell if your catalytic converter is working and there really are no exhaust sensors beyond that then it shouldn't make your check engine light come on. Any car that I have had that I changed the exhaust I never had any problems with check engine lights coming on.
 

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considering that your rear o2 sensor basically is just there to tell if your catalytic converter is working and there really are no exhaust sensors beyond that then it shouldn't make your check engine light come on. Any car that I have had that I changed the exhaust I never had any problems with check engine lights coming on.
Yea I agree with that.
 
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