Will aftermarket additions, outside of my roof rack and spider spikes (tire thingies instead of chains), void my warranty? I wanted to add a sway bar also and wanted to know how difficult it woudl be to install?

 

Warranty can be denied if they can prove that the sway bars are a direct link to failure of a component (if you got a race bar or something). As for the install, some customers do the install themselves and some don't. If your confortable working on your car you should be fine.