None of it will totally void the warrantee.
But if you have a mod to your springs, and the spring mount breaks, they aren't going to cover it.
If you have aftermarket exhaust, and your stock exhaust bracket breaks, they aren't going to cover it.
But they have to prove the mod caused the problem.
So if you run NOS, or a turbo, and blow up the engine,
it's pretty easy for them to prove that your mod caused
the problem. But if you just have a different muffler,
or different air cleaner, it is harder for them to prove
that the mod caused the problem.
But it's not like adding something instantly voids the warrantee.
It doesn't work like that.