Looking for Explanation of what is on the gen 3 exhaust

While trying to repair a noisy heat shield on my 2010 Gen 3, I noticed some strange pipes and what looks like some sort of actuator on the side of the exhaust between the cats and the main pipe going to the muffler. Looks like a resonator of some sort. Any idea what’s the function of it?

 

I really don’t know what it is. There is a hose connected to it that heads up towards the left side of the engine. I suppose that it could be some sort of preheater.

 

The rattle that I thought was coming from the heat shield seems to be coming from that thing.

 

Just read it. Useful. Ich glaube meine Auspuff muss wechseln.

 

Are there any part numbers out there for this? Looks like a future job.

 

Thank you very much. Now I understand more about why/if the mysterious rattle seems to be coming from nowhere. After looking at the shop manual, perhaps it’s a loose flap or an interior part of the exhaust heat recovery system. Looks expensive. I’m not sure of what / where the No. 3 meter circuit plate is though. I like to understand more about the serviceability and what is involved with the repair or replacement of the EHRS? Your help is appreciated. How much is a shop book?

 

I’ll bet that it calls for a complete replacement. Thanks

 

Thanks.

 

Well, after careful inspection and testing all other rattling possibilities, it appears to me that there is some damage to the heat recovery system. Specifically the actuator seems to stoved and out of alignment. It must of took a pretty good whack to bend it
like that.

Please see the attached pictures. What do you think?

 

I’m fearing that the rattle is internal. There doesn’t seem to be any other visible signs of damage though. Except the heat shield was beaten up a bit. There doesn’t seems to be no interference with the exhaust flow though.