2013 heater manifold (back crossover) replacement questions

[Mozambique]

I would second replacing the 8 intake manifold gaskets. They must harden and lose elasticity over time. I got mine from the dealer in Toronto. Don't recall them being prohibitively expensive

 

[Mozambique]

Replacing the rear heater manifold a little fiddly re. Bolt access, but not too bad. While doing mine I also replaced the coolant hose that runs through the valley. Seemed a good idea while I could access it