None required. ECU uses the front O2 sensors for closed-loop fuel adjustment, and only uses the rears to monitor catalyst performance.No emissions or any inspection at all where I will register it. Just wondering if any ECU mods are needed to keep fuel mixtures accurate.
Very rural New Mexico. Not Tijuana, but pretty close to Juarez.No cats? Where do you live? Tijuana?
14CUX only uses upstream O2 sensors.The ‘67 109 SW had a Rover 3.9 V8 with the 14CUX. We only ran the upstream O2 sensors and didn’t throw any codes.
Ah yes, missed the GEMS part!14CUX only uses upstream O2 sensors.
Aside from removing the cats and replacing with welded in pipe, is there anything else that is needed?
No cats? Where do you live? Tijuana?
I have a y-pipe in great shape that has no cats that came with a parts truck. I am buying a D1 with a y-pipe in poor condition with cats. I just don’t want to spend the cash on a new y-pipe with cats for a vehicle that will see about 1000 -2000 miles of use a year. However, my immediate goal is to make the truck quiet as the current y-pipe leaks a lot of exhaust and noise. My neighbors tolerate my garage noise and too many vehicle disease well. Figure I should avoid making it worse with an obnoxious loud exhaust.What is your goal with removing the cats? That helps determine whether you'll achieve it by simply cutting them out.
Please do report back.If it helps, I just bought a D1 Y-pipe with cats off ebay for under $300. That's more than $0, but it's not bad. It hasn't shown up yet so I have nothing to report in terms of quality or performance, but I wanted to throw that out there as an option that might achieve your goals for not a ton of money. Sell the cats from the crappy Y-pipe to a metal recycler, I plan to do the same with the ones I'm removing.
I have a y-pipe in great shape that has no cats that came with a parts truck. I am buying a D1 with a y-pipe in poor condition with cats. I just don’t want to spend the cash on a new y-pipe with cats for a vehicle that will see about 1000 -2000 miles of use a year. However, my immediate goal is to make the truck quiet as the current y-pipe leaks a lot of exhaust and noise. My neighbors tolerate my garage noise and too many vehicle disease well. Figure I should avoid making it worse with an obnoxious loud exhaust.