Try www.batlground.com, They have an awd dyno. You can use your trap speed or et and vehicle weight to get an approximate #.

 

Well i just went and used a hp calculator online to see what numbers it came up with. I entered it 2 ways. The first I entered the weight with driver and mph in the 1/4 which was 5400lb and 93 mph. That gave me 339 at the wheels and 400 at the crank. The second way i entered it in was 5400lbs and this time i put the e.t. which was 14.3. This gave me 365 rwhp and 431 at the flywheel....All of these numbers are figured using 18% driveline loss, so I really dont know how that would factor in since I imagine the AWD sucks up some hp so who knows.

 

Awd does eat more hp. I don't know how much.