I have a check engine light due to a cel throwing because of my invidia dp. When I go to the track should I clear it w/ the OBD II scanner prior to racing or leave the check engine light?

 

Leaving it is fine.
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If you leave your check engine light lit isn't your a/f ratio going to be different than if you clear it.

 

What would A/F ratio have to do w/ the CEL?? you know what im saying dude. Listen to us and you'll be fine

 

I'm definatly listening just curious since I can smell how rich my engine is running with this dp.

 

Is the DP catless? If so - that's what you're smelling. Installing a DP isn't going to make your engine run richer (that's controlled by a closed feedback loop using your oxygen sensor for input and injector pulsewidth for modulation).

The O2 sensor in your downpipe has nothing to do with that closed loop circuit, it just monitors catalytic converter efficiency.
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It is cat less. I did not know that, thanks for the info.

 

The only bad CEL is a flashing CEL.