Help requried in diagnosing engine fault codes

[Ronin]

Hello

I'm intermittenlty getting the below codes:


16804 - Catalyst System; Bank 1: Efficiency Below Threshold

16814 - Catalyst System; Bank 2: Efficiency Below Threshold

17831 - Secondary Air Injection System; Bank 1: Insufficient Flow

17819 - Secondary Air Injection System; Bank 2: Insufficient Flow

I have already replaced the top part of crank breather hose, I will be doing the bottom left hand side and the little plastic vacuum pump next along with removing the inlet manifold and replacing throttle body gasket and inlet manifold gaskets.

Is there anything else I should be looking at? I think re-doing all the vacuum tubing wouldn't go a miss.