The Definitive Differential Thread
This thread has all the Q&A's to upgrade your diff. When I got mine put in at a good dealer they said i voided my warranty for the diff but that was it. Everything else is good. But I blew a diff bushing the 3rd autox having it. So upgrade that chit when you have it all out. I went with SPL but I almost regret it now... Almost. But it is tight like a freshly recruited hooker. For a DD I would just settle for the whiteline.