My truck the plug was rounded off to put the sensor Into the cat so I've still not got to install the sensor yet I'm just really curious if I should just go ahead an take the cat on off an just do a true dual no cat

 

Still need the sensors...... else it annoys the PCM.

If you don't have inspections/testing where you are, you can do pretty much whatever you want, provided you can find someone to do it.... (unless you have the stuff to do it yourself.)

 

^+1 to that. Id figure out what way ya wanna go and do the sensor at the same time. Only lose the cat if it isnt a legal requirement, otherwise leave it alone.

 

No emissions here were im at so.im thinkin cut tgr cat off drill a hole in a new pipe so the sensor will thread I tthe pipe then weld it on tge right bank an then the left bank wont have one an just true dual it an use no cat

 

If you can do it all yourself, you will be golden. You can get weld-on O2 bungs at most any exhaust shop, or possibly even the parts store.... Don't weld 'em in. That pretty much guarantees you will have to replace it in a week. May need to do the non-fouler trick on the post-cat O2, to prevent the PCM from whining about cat efficiency.

 

Then cut the cat and weld in a cross over, an H pipe would be easiest to weld a bung in, and stick the front o2 there. I wouldn't not use a crossover in a true dual setup.

+1 to everything HY said, definitely dont weld the sensor..

 

+1 to HeyYou and Johnn123 posts.

 

I'm no welder but it doesn't leak , honestly , lol . I ran out of gas and just used inner shield wire .

I had an exhaust shop bend 2 30* bends on each end . Came home , cut it up and welded this together after a few measurements .



I trimmed it to fit once the cat was out and welded everything to the truck . I did remove the pass side down pipe and new pc to weld it as I had no way of getting at it on the truck . I tacked it in the position I wanted first of course . Reinstalled it , and welded the drivers side . The bung was welded in while out .



That's my fouler or cheater as I call it on the downstream sensor .



Because I had the fouler , the muffler , and can over look my welds , it cost me under $20 to do this VS $200 as quoted at the shop . My cat was shot

 

Yea I got a welder an stuff I've gotta get the rear O2 sensor still but I'm goin away with the cat an gonna run true duals an put 2 mufflers an call it done but first I'm goin to put the upstream O2 sensor in an run it that way till I get my rear sensor an mufflers then off with the cat

 

How is everyone doin the trick to the downstream sensor?