Here's a link for you.

http://www.granatellimotorsports.com/magnusonmoss.htm

Now are we sure the manual or warranty paperwork doesn't have anything in it about aftermarket parts voiding the warranty cause if it does then the magnuson-moss goes out the window for this situation. You can have the parts if they didn't cause the issue you had and they should have to replace it. You had less mods than a stage 2 mopar setup has since those say you should have a 3 inch exhaust and those are still supposed to be under warranty from what Bob Wilson dodge told me. Now what about motor mounts or suspension mods? And what issue have you already had replaced under warranty?