I dont want to void my warrenty. K&N Filter anything eles

 

i think thats pretty much it..if you wanted to you can

tuner, exhaust, like you said intake..efan..

but off the top of the head intake..without voiding..but eh who needs warranties (:

 

as far as i know, you can put all kinds of bolt on mods on your truck and not void the warrenty as long as the parts put on do not play a factor in the problem you might encounter.. so if you put intake and full exhaust on, and say your power steering goes out... as far as i know, they have to cover it since it is not affected by the exhaust or intake... and if you raise hell at a dealership they will usually warrenty it since they dont want you to make a scene haha. im all to familiar in that area :)