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Old 10-08-2013, 12:16 PM
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Join Date: Apr 2010
Location: Macomb, Illinois
Age: 52
Posts: 797
Gender: Male
Vehicle: 2004 Quad Cab diesel
Trim Level: SLT
Color: Silver
Engine: 2005-20?? 359ci (5.9L) Cummins ISB 610 24-Valve Diesel I6 325hp 610 lb/ft
Rep Power: 5
Rep:221
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I would say the loss for an automatic is getting better and is between 10% to 15% these days. It used to be considered 20%. Different dynos give different results. Mustang dynos are known for giving low numbers. That doesn't make them wrong.

My Challenger, which is a 5.7 hemi, has exhaust, a custom tune, catch can, and CAI put down 370hp and 410 ft-lbs at the rear wheels. Those numbers seem high to me compared to other people, it was probably a dyno that read a little high.

To answer your questions, I'd say a late model hemi truck would put around 330 hp at the rear wheels.
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2004 3/4 ton Quad Cab, 24 valve 5.9 Cummins
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