That is incredible testamony! THe fastest Duesenberg though was the 1934 Mormon Meteor, which was a stock SJ with a special body. Actually, it had a 1935 motor in it, so it had 400 hp, instead of 320hp. It did 160 mph at Bonneville. Not bad, eh? Duesenbergs are incredible, simply magnificent and fast cars.
http://www.supercars.net/garages/Duesey/16v2.html