Intake Manifold and EGR Cleaning/Replacement - How hard is it really?

The only significant difference in 3rd gens (2010-2015) was Toyota FINALY ditching the low-friction piston rings, partway through 2014 model year (the earlier rings have proven prone to oil consumption).

there were revisions to the EGR valve, and the intake manifold (apparently EGR passage revisions), but I’m sceptical they accomplished anything.

I’ve got a 10, have cleaned the EGR twice now. The car has about 65k miles, we purchased new in 2010.

 

Since you bought the parts I would install them after I verified they were oem. However I would keep the old parts just in case.

I would definitely change the oil every 5k miles and change the engine coolant every 30k. Those are the things that have worked for me on a 340,000 mile v.

I proactively changed the egr valve with the redesigned version and had the latest ecm software updated. In Europe there was an October 2014 recommendation to update the ecm to extend head gasket life. This was the only Toyota recommendation specially addressing head gasket fails and was released to Europe only. However it is assumed the US code, which was updated many times, would have included any reliability improvements.

Your car has had the inverter issue resolved which is a good thing. My inverter failed early as well without warning. I have changed the hv battery with oem and the brake booster which had a special extended warranty, now expired.