On the #17410 assembly there are 2 canisters. Which one is the cat ? Or maybe both of them are ? My guess is - its the one closest to the engine correct ?I think you got the wrong diagram for the exhaust pipe. That is for a V6 with the two connections to front and rear banks, you can also see the catalytic converter in the middle (the canister with ridges in it). So likely for Gen 3.
View attachment 56066
This should be the correct diagram for Gen4...the CAT is up by the exhaust manifold, and the accessible parts underneath are expensive to replace but pretty worthless to a thief.