Welcome.
As for Warranty. Any mods will void the warranty for that section. I.e if you change springs then your suspension warranty can be void, but the drivetrain warranty would be fine. But they also have to prove your modification caused the issue. If Toyota installs TRD springs then warrenty would most likely stay intact, but with 3000 miles left I wouldn't worry about it.
And sites listed for parts are good. TRD SPARKS GOOD PEEPS as well as GETPAW.COM
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