Can someone school me on what a new diff will provide me (benefits)?

[40th GT]

Edit:
Actually, I'm using Nitto DR's. Not sure if the Nitto Drag Radials are still considered "slicks."

Nope, drag radials are drag radials. Tires are considered 'slick' only if they come from the factory with no tread on them.

 

[SRT Handz]

I went with a Auburn HD diff last year and Love it. it makes both wheels spin when i launch everytime and give me a great handling advantage. I can feel the torque switching between wheels...its awsome

 

[007]

Some good info in this thread. If you are doing mostly one-wheel burnouts then you should either get the stock one rebuilt (cheap) or upgrade.