Duramax vs Powerstroke

2004 LLY Duramax Crew Cab short box with Edge Juice with attitude. 4″ exhaust.
2005 Super Duty 6.0 reg. cab short box. 8″ lift on 38″ mickey thompsons. K&N intake elbow with over the road Cummins filter. ARP head studs. River city diesel EGR delete. SCT programmer with River City Diesel custom tunes. 5″ exhaust.
Neither truck is on Max tune setting.