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What kind of codes/problems do exhausts usually cause? I am about to swap my stock for an HKS but I am worried about passing inspections with a CEL. I have an OBD so I believe I can erase the code before inspection but can anyone confirm this?
 

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If it's just the muffler then you won't get any CELs. You only run into CEL problems when you go with aftermarket headers. I have an aftermarket y-pipe and cat-back but have all stock 02 sensors and never had a CEL.
 

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Yeah... intakes and headers can cause CEL's... can't really remember hearing about exhausts being an issue.
 
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