My mate just bought a monstatorque box here in canberra. They rate it to 700rwhp, supply the zf tune for it and will provide a 12 month/15,000km warranty. $5,250 inc post iirc. Can't remember if that's a cryo'd or billet shaft but the power rating is more than what he needs anyway so doesn't matter too much. Local shop here gave me a rough price of $7-8k No tuners in Canberra build boxes so don't have that luxury, but for the sake of $500, maybe even $1k if the tuner could build it and warrant it, then I would probably go with them Or like Kosij said go th400 lol