Ok Ive been reading and reading and reading about the auto to manual swap but there is ONE last thing im not 100% on the rear diff!!!

I have read that the 2.7T A6 comes with a 4:11 rear diff so with that said I wouldn't need to change mine out and save 300 bux but how do I know for sure? I decoded the Tag in the trunk but it said nothing about rear end gearing. Is there anyone that can help with a 100% answer?