to do this, you need 2, one of them, you cut the bottom off, so the o2 sensor can screw all the way in, then that will screw into the unmodded one which goes in the pipe

 

https://dodgeforum.com/forum/2nd-gen...ving-cats.html

 

ok that makes more since now. i will just do that instead. any clue on wat size i need? i couldnt tell from just matching them up at AZ because i couldnt get the sensor to screw into the fouler

 

i am just starting out and i had put duel 3" pipe from the exhaust manifold with a flowmaster 40 series muffler on. i dont have a cat or an O2 sensor it is just zip tied to the frame do i need to install it back i am running about 13 mpg.
thanks

 

it think someone else on here has theres zip tied to the frame also. it think it works just as well. do u have a CEL light?

 

18mm is what the pic shows.

 

alright gotcha. thanks aim

 

no lights. it runs a little richbut it has sense i bought the truck any ideas on how to lean it out like i said i am new to this area

 

im pretty sure its 17mm for our trucks

 

DUAL 3"?! thats insanely too big of a system.......as for the ziptie, yes thats fine for the rear sensor....13 mpg is decent for these trucks