I've towed with fords (7.3 powerstrokes years 97, 99, 2000, 2001, 7.3 IDI's turboed, 6.9s) and dodges (my 12 valve) and (2002 5.9's and 2005 5.9's) So, the 12 valve does great, gets great fuel mileage and has adequate power at all stock settings. Your not going to race anyone off the line and...