Performance Differentials

I have a 96 328i which i have modded with a UUC short shift, ansa exhaust, BAS springs, wheels and chip... i am going to purchase a performance differential in the coming months (upgrading from the stock 2.93 to a 3.46 as recommended by Korman) and was wondering if anyone knows the exact acceleration improvements over stock or any websites that may have said information. Thanks a lot!
-Alex