I misunderstood your edit above as your secondary cats were bad...I apologize for that. I'm in the same boat as you; my cats are probably just below the 92% as well - my car runs great, no decrease in mileage or performance; just efficiency threshold. I stand by my my post about getting a tap vs a thread chaser (in your case). Since your cats are fine, repairing the threads and new sensors would be the 1st option I would try. If for some reason you can't repair the threads, then either welding a new bung or replacing that section with straight pipes would be the 2nd option. AFAIK, there are no aftermarket bolt on options for the V8...plenty for the V6. Exhaust shop would be the way to go, or DIY if you or someone you know can weld, especially if you have access to a lift. If I lived up there I would weld it for you. Deleting the secondaries is cake, as it's a straight piece of pipe on each side with no bends. That was my 1st mod, cost me $100 to have a shop do it (I don't have a lift)Ilya wrote: ↑Fri Aug 14, 2020 8:03 amI'm not sure where I mentioned my cats being clogged but to my knowledge they aren't. They might not be efficient and below the 90% (or whatever that number was - someone in the other thread posted it) point, but my car runs fine. If my cats were clogged, I would expect the car to drive poorly. It runs like a raped ape. With or without the sensor.
I wasn't able to get the tread started with the 90* elbow so my guess is I need a tap to COMPLETELY get a new thread.
Re-thread Tool - https://www.amazon.com/ARES-71112-Oxyge ... B07253W495
Along with:
2x Bosch 15370 (replaces 226A0-ET000 - https://bit.ly/2DQDuaI)
I would consider replacing the pipe entirely if there was an affordable after market option. The OEM option at $1k is definitely the nuclear option.
I think this is the plan...anyone see issues with it?
So far, no codes as of today. I am not messing with the passenger side for now. I haven't had any issues with it.