It won't "void" the warranty. Look up the Magnuson-Moss act.
If you have a problem that can be traced to a mod you made, the manufacturer can not honor the warranty on that. But for an unrelated problem, they have to honor the warranty.
Of course dealers or manufacturers may try to make you think your mod voided the warranty so the broken seat (or another unrelated problem) won't be covered. You might even have to sic a lawyer on them. But the law's pretty clear.
Not much of what I own is covered by warranty. However, there could be a lot of aspects of a tractor that a dealer might not want to cover due to adding a turbo.
So, just about anything having to do with the engine, pistons, rods, valves, etc... And, then if you're pushing in more power, then the transmission, differential, or other parts of the drivetrain might also be excluded. Exclude the PTO too.
The headlights may still be under warranty.
Now, you might argue that a bearing or seal might not be impacted by the turbo, and then it would be up to the service department and dealer whether or not they choose to accept or exclude the repair.
It all depends on how important that warranty/dealer service is.
The legal system is expensive for everyone involved, and if you blew a rod through the block, it likely would be a losing battle if the dealer chose to fight it.
