Originally Posted by vividracing
They can not legally deny you any warranty work without PROVING that what you modified, is the cause of what you want warrantied.
This is not likely accurate. He has an 07, so he likely is on a CPO warranty at this point, which is a service contract, in which they can deny warranty work for whatever mods they want.
Though maybe the OP can clarify if he is still on the factory warranty or on a CPO warranty?