VF is a sweet company!
Dyno numbers are so hard to go by... depends on the temp, humidity, what dyno its on, how many fans are going (this can make a huge difference... if you arent atleast replicating the air flow you would be getting while driving, it can be a dissapointing run) etc..
looks like the VF website says 350hp, so his numbers are probably pretty accurate being that it was done at DB's. these things have so much torque, and area under the curve since its supercharged as opposed to turbo'd, it feels faster than the same amount of power out of a 1.8t with a big turbo, and much smoother to drive.
I believe there is a race gas file too, which brings it to 400hp/330 tq
1999 Audi A4 Avant 1.8TQM