I have seriously raced five Cummins with my truck. This was before my lift and tires and while I was also running a very hot file from Eric@ID (that eventually the truck couldn't handle anymore. Broke three injectors, HPOP, Fuel Pump, etc.).
Race#1: 2005 2500: Bullydog Triple Dog w/high horsepower crazy larry setting, intake, exhaust, boost fooler, and pusher pump.
Outcome: 4x4 boosted launch. Jumped out two trucks, he gained one back on me but then that is where we stayed till about 75 mph.
Race#2: 2004 2500: Intake & Exhaust.
(My truck was stock at the time)
Outcome: Started at a 25mph roll. Both got on it, by 60 mph I was ahead by half a truck length then we both let off.
Race#3: '98 2500: Turbo, Injectors, Intake, Exhaust, Clutch, etc. (Truck is fast, sub 13's at the track)
Outcome: Jumped him from the start (4x4 launch) by about a truck length, but he quickly relled me back in. Leaving me probably 3-4 trucks behind at probably 70mph.
Race#4: 2005 2500: Tripledog w/CL, intake, exhaust.
Outcome: Started at 30mph roll. I pulled him from the third honk all the way to 80mph. Finished 2-2.5 truck lengths ahead.
Race#5: '98? 2500: Twined, big sticks, ic, ported heads, you name it, etc. (VERY fast truck)
Outcome: Started from a 25mph roll. He pulled me through every gear, ended up atleast 6 lengths behind him lol.