So, I sold my 08 gt500 but the guy wants the cats put back on. I have the dynatech pipes on order (he paid for them) hopefully get them soon. I know I need to get the rear o2 sensors again, since I dont have them on the current exhaust. I have 2 extensions on the front because of the dynatech LTs ( came with the headers) and have 2 bbk extensions in a box Im assuming Im going to need for the rears (came with a bbk xpipe) Does anyone have the part number for the rear 02s? And are the extensions interchangeable? I remember the rear being a different color of plug, not sure if the pinout is different or not. I cant seem to find if they are different, since I would then need to buy a rear set if they are different than the fronts for the Safety inspection. Ive got the retune on order. Thx for any info.