HKS Exhaust Questions.

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10 MS3
I am looking at getting the HKS cat-back. From what I have read it deletes the 2nd cat. Does the 2nd cat have an 02 sensor or not?
 
i believe there is an o2 sensor before the first cat, that is used to read a/f.
and one after the first cat, that is for obdII emmissions readings. deleting the second cat should do nothing but add power !!
 
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