There's a host of other mods you can do to the car that won't void your warranty. Just about any mods WON'T void it as long as the valve covers or intake manifold aren't removed to do the mods. Watch out for short throw shifters, some places will try to void the
tranny warranty for those. Also if you're looking for a tune, get a handheld tuner instead of a chip. Some dealerships will look at the ECU anytime the car is brought in, just to see if a chip has been installed. It gives them an excuse to get out of the warranty.