Bolt-ons (exhaust, HFCs, intakes) shouldn't void your warranty. Just do what I did, before doing any mods ask around some local dealerships and see if they are cool with bolt-ons. If they are fine with them, then they won't void your warranty if you do install them. If not, then try to find a different place. I was lucky since the dealership I went to regularly was fine with me putting them on my car.
Seat time is probably a lot more helpful than mods, but no reason you can't do both
