So last night, I finshed my replacement of my USDM tranny with the JDM tranny w/ the LSD. After driving around for a while, I got on it a bit.
grip when on the throttle around corners in 1st & 2nd gear is MUUUCH improved. Even in the rain, mashing the gas from a stopsign w/ the wheel to the side will launch the car in the desired direction with little hesitation. acceleration from a stop in the wet is MUCH improved.
Today, in the dry, I got a chance to hit some hard corners and launch the car a bit. The car seems much more responsive around corners, and even though wheelhop seems increased a tiny bit, it launches much harder.

for the LSD!