ok here i got this question for you or anyone that can answer it for me. emissions is coming up for me soon and i need to extend the 5 five wire O2 sensor to under the car, now do i use the same wire gauge or a thicker wire gauge for extend the wires?? because i have a bad cat. so my cousin gave me his Ebay header to use so i can put a high low cat or a OEM cat. So that way i dont have to buy that Y5 $500 cat. Also will it effect the O2?

I have the D16Y5 so it has a five wire O2 after the cat.