I've had my 2.5" cats like that since Winter, as well as four O2 sensors. I've had a "slow response" O2 code for a long time, so I want to be able to replace the cat pipes instead of repairing.
What size are your collectors Jon, are they 2.25" at least? I plan to use the OEM collectors and build 2.5" pipes, until I get better headers. Then I'll replace the collectors. I thought about 3" cats and pipes, but fitting the larger sizes will be harder.
Please take your time with your and get a good fitment of the piping. I'd like to know how the 3" piping would work, and you have the same front driveshaft as I will. Regards,