Suspension question with bonus ARB diff breather install

Hello everyone,

Long time lurker, first time poster. Purchased a 2015 used limited from the Toyota dealer less than a year ago (Toyota was the previous owner). Was installing the ARB diff breather on my rear axel and while i was under the car I took a look at the suspension. Noticed that it appeared to have a remote reservoir. Followed the line and came to what appears to be the reservoir (pictured) attached to the side of the frame. It is connected to both the front and rear suspension. What I thought was odd was that I didn't think any models except the TRD Pro came with remote reservoir suspension. In addition the suspension appears to be made by Yamaha. Still drives amazing and have no complaints about it. Just curious if anyone had any information about it and whether it is standard on my particular model or if Toyota gave me a little present. Also, would these particular shocks be compatible with a 3" spring lift? (i.e. switch out the coils) Or would I need to replace the shocks as well? Plan on adding some weight to the vehicle and running 285s to make this a camping rig.




As promised, here are some pictures of my diff breather install.





Left some extra hosing near the axle (out of the picture) to account for additional wheel travel and 3" lift down the road.

 

From some quick research I can see that it is a factory option and not aftermarket but I'm not sure with what other options this came with. I haven't ever seen one of those. Subbed for more information

 

It's called xreas

 

Didn't know they put that system on 5th gens. Also didn't see the hard line to the other shocks in the photos.

 

Thank you. That article helped a lot.