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We have done them on several cars. It helps improve the ride substantially. We haven't done a video for the Eibach's yet but here is a video we did on the Y with H&R Springs.
You absolutely need an alignment. They can dramatically affect Toe. I see more often than not that installing the bearings pull in the front wheels causing a decrease in Camber and an Increase in Toe out.
Source: I am an alignment Tech and have installed dozens of these bearings.
@gearchruncher said it best. Until you are pushing to the limits of traction, track mode is not going to do much for you other than being able to turn up regen. After that, it's all personal preference anyway.
I'll be interested to see what that feels like for you. We tried the H&R lift springs and it was a noticeably harsher ride. Also, the damper length stays the same so you will probably top out the shocks when going over rough terrain. Not a great feeling.
Took the car out to King of the Hammers in Johnson Valley, CA. I was the only Tesla that attended in a sea of Rivians :(.
OMG_Rivian was my travel partner. His Rivian is in a few of the photos.
Here is the event we went to...
Yeah, factory stud length is no problem, but anyone looking at extended studs may have to partially pull the bearing in order to have enough room to slide them in. Depends on the length.
Rear is the basically the same as the front. Slightly less room to work with the various arms in the way.
It is easier to replace the bearing than replacing studs, IMO. I had to transfer my ARP studs to a new bearing, that sucked.
-Get an alignment done right after delivery, most of the cars that we've seen right out of the factory have had pretty terrible wheel alignments. You'll save on tires if you make sure to keep up with alignments and tire rotations
-Premature Suspension Bushing failure. Start checking them around...
If you want good steering feel and responsiveness you are going to want a wider wheel. 10.5 is Ideal but the most common size you are going to find is 9.5. Do you have any sort of camber arms installed? a 275 is going to be severely under utilized without additional camber and you will have...
Model Y is only a little slower than the 3 on Track. You can fit a much wider tire on the Y compared to the 3. Like @fiehlsport said, definitely change out the fluid. Pads too if you can.