I just got the RT cat, and while I was taking off my old cat I noticed that there was no hole in the RT cat for the oxygen sensor. Am I supposed to drill my own hole, or am I supposed to find some adapter to screw the oxygen sensor into my b-pipe on my greddy catback?

 

Well I have a 97 (obviously) and I don't know if the placement of the o2 sensors may be different. I got the Apex'i catback and we had to drill a hole in the bpipe section right after the cat. You also need a O2 sensor thread. Looks like a big lugnut that you weld on

 

i have a 99 and i do not have a O2 sensor..

the r/t cat is not made for your year car.

if it was it would have had the sensor hole..