[suprasforlife]

LSD diffs are better, lets the car turn better. If you put a locker in you will make it a true posi where both tires spin the same thus making it harder for the car to turn because both the rear tires want to go straight all the time. There is no give between them. If you enjoy taking corners at highspeed do not put in a true posi. Short wheelbase and true posi=poor turning. True posi is more for dragsters. If you live somewhere where it snows and you have to drive it in the snow all I can say is have fun, car won't turn for shit, not as bad in rain, but not as good as an LSD.
As for the howl have you changed the fluid lately? I have never take a mkII rearend apart but I have pulled several other rearends apart and howling is usually a bad bearing or bushing. Sure its in the rear and not the tranny, sound travels through the driveline in a funny way sometimes making it sound like something its not. Hope this helps some.