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First of all, thanks to everyone that helped me with the Borla headers problem previous.

Now I have a newer problem.
I had a road trip last weekend, and I dont want too much attention and noice so I ended up putting a silencer in my exhaust.
First part of the trip was amazing, nothing wrong with it, a bit quieter.

However on my journey back, a CEL suddenly appeared, I didnt pay much attention to it. Once I am back home, I removed the silencer and drove it around with the CEL still on, After I brought some stuffs start the car back on, CEL is gone.

I tried putting the silencer in the next day, started the car, no CEL, once the car is turned off and started back on CEL appeares. After that I took the silencer off and CEL disappeared.

I just want to know why does putting a silencer on gives a CEL.

This is my exhaust set-up

Borla Headers
MR catback exhaust
Cats are untouched.

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