Australian company Altra9 based in Queensland have designed a bolt in kit which fits into the factory housing. Suits -> 10 bolt small salisbury which is found in TD, TE, TF and TG models.
28 Spline Full Spool kit (suit drag/track only) -> $2160 – 2018 price
28 Spline LSD Kit (street, track and drag racing) -> $2540 2018 price