It doesn't matter where you run to, it's the same when it comes to warranty coverage. Don't think Toyota, Subaru or Honda etc. would be any different. If you mod and they can void a part or your whole warranty, they would. Also don't believe that you can just mod and not have possible issues. Or that there's some magic car that would let you mod to your heart's desire without the possibility of consequences. There is no such thing.
It has been said before, if you want to have the least possible mechanical and warranty issues, DON'T MOD PERIOD!!
The key is finding a good dealer.