Guess what I finally got, bitches! E46 LSD (not M3), with 75/30% lock and short gear ratio...

Welded diff doesn't come close to a LSD when drifting.

>ive also seen LSDs perform and they are shit. If one wheel is off the ground, the other wheel seems to get not power at all.

You saw a torsen differential, they work like that.

My subframe is already reinforced, I know the car's issues.

Viscous vs clutch, learn something.