Yea easy to achieve torque on a Diesel, mapped 530d can be up around 450 ftlbs
But like anything you wont get more power without adding more fuel so kind of defies the point of having a diesel in the first place imo.
I think if you look at the market, which Subaru will have done, and not just a Subaru forum, and realistically ask who is going to buy a Subaru diesel over the likes of Audi A4, BMW 3 and 5series, Passat, Avensis.. ??
i dont think there is going to be too many, whether they invest Billions into Direct Diesel technology or not,
im sure they have weighed up the cost against the end result and said not worth it
Even if they ticked all the boxes, alot of people wont get over the Subaru name, and opt for the old reliables