265's up front and 295's out back (275's and 285's weren't available at the time of purchase). When I go to 18's, I'll most likely be running 265's squared or something in the 265 front/285 rear range.
Why replace the stock LSD with another LSD? Because an aftermarket solution is another way to fine tune the balance the car. The stock LSD is designed to work in a wide variety of situations, and since to my car is nothing more than a weekend play thing, daily driver versatility is not a requirement. With the aftermarket unit, I'll be able to tailor the handling dynamics and ability to put down the power of the 1 to my specific tastes.