Possible to make them pass emissions with a single cat?

 

Due to laws in a lot of places possibly not even if you switch to dual cats and retain all equipment.

Here is way: Most places make it illegal to change the number of Cat(s), and to changethe location of the cat(s).

In the case of LTs you would move the location for sure, and increase the number, which oddly enough is illegal too.

I would check your laws in your area.. but there is something to ponder...

 

Well i'm in MA which has probly one of the strickest emission laws.