Satomi93

Hi guys, a week ago I test drove my friends 2015 rwd is350 f sport and fell in love. The car was quick, responsive, the shifting was fast, and it looks gorgeous. However there's one thing stopping me. When I would push the car to its limit through corners, I could feel the inside tire unsettling the car. My friend said that they don't come with an LSD. I've looked online and found no aftermarket lsd available. The only news I've heard is potentially using the lsd from the rc350 f sport, but I might have completely misinterpreted that information. I would intend to autocross the is350 if I bought it, so no lsd is kind of a deal breaker. Does anyone have any information for my predicament? Thanks in advance.