They'd be of interest if you own a 240Z/260Z, 280zx, 1600, Z31, DR30, or import R31.
Basically the newer R200 found in later skylines is too short for our cars.
Back on topic though, so with the 3.0L is worth dropping to say around a ~3.5 LSD you think without harming accceleration?
Would probably sit on nice low revs on the freeway I suppose.