Ok my car has 4 o2 sensors... My jet hot long tubes came with 2 o2 bungs... I plan on just plugging them into there and deleting the O2 sensors at the dyno tune..

Or would it be smarting to put in o2 sims on the last two O2 sensors that are suppose to go into the y pipe.

 

Are you saying you are plugging the O2 bungs in the LT's and running without O2 sensors? That means you are converting to open loop programming? Are you sure you want to do that?

You can't plug O2 sims into the pre-cat connectors... won't work that way.

You will get much better idle and low load operation, better fuel economy, and less plug fouling running closed loop.... those are the big advantages of the modern EFI systems. Open loop is fine for "track" cars... I run open loop, but if you have a daily driver, there are advantages in closed loop operation.

Or did I misunderstand the question?