Originally Posted by dodge man
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.
This 2011 got 306rwhp and 331rwtq completely bone stock
This 2011 got 318rwhp and 334rwtq and not stock it had a K&N CAI, Dynatech Supermaxx LT headers w/ Magnaflow Cats, FM 50HD dual out exhaust and stock 3.55 gears
2010 all stock, Ripp says the test they get out of this 2010 will be basically the same for 09-11
once the engine gets hot the RWHP falls from 290 down to around 267.
OP wants info on his 2011, says he got 265 which coincides with this information from RIPP