Wow, that is impressive ... more torque than a 3.0L twin turbo Disco. A quick look at the Subaru website indicates the most powerful WRX STI Premuim as being rated at 407nm (not sure where that's measured). That's about 150nm less than an off the shelf bog standard 2.l litre Merc CDI 250 sedan, which is hardly a racing car and almost 200nm less than an SE Disco.
Yours must be very heavily modified.

