As far as warranty I have been told verbatim from 2 different dealers: The only reason the warranty would be voided is if the modification CAUSED the problem with the vehicle... and of course the warranty does NOT cover the aftermarket part itself.
This was told to me after I tired to have some engine work done on a jeep with a lift kit... they tried to make me pay for an exhaust maniofld that cracked saying it cracked because of a suspension lift. . stating the entire vehicle warranty was void. So I kept looking until I found out that was NOT TRUE.
And I do believe someone said above it depends on the dealer... this is true BUT in truth they can not (or at least should not) void you out for modifications... unless it is certain that is what caused the problem.
This was told to me after I tired to have some engine work done on a jeep with a lift kit... they tried to make me pay for an exhaust maniofld that cracked saying it cracked because of a suspension lift. . stating the entire vehicle warranty was void. So I kept looking until I found out that was NOT TRUE.
And I do believe someone said above it depends on the dealer... this is true BUT in truth they can not (or at least should not) void you out for modifications... unless it is certain that is what caused the problem.