Magnum VS Hemi

stixx said

No way an induction change is going to get you 70 hp and 74 lb-ft with everything else being the same, more or less.
The difference is solely that the first rating is given as SAE net (with all accessories AND installed in a vehicle), while the crate motor is rated as SAE gross (on a dyno). Numbers are so deceiving...

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That's a valid point. The exhaust test linked above was done with a water pump, but no alternator, AC compressor or power steering pump. So, it really isn't an apples to apples comparison.

Another issue with my comparison is that I am talking OE rated numbers compared to a dyno run. Who know if the factory rating was accurate, they could have underrated or even overrated them. Couldn't find a dyno run with a kegger to compare, but I did find a chart for a Hypertech tuner where they showed RWHP at 216 @ 4250 and RWTQ at 304 @3250 for a 2000 Ram 5.9, which seems to indicate that a stock 5.9 made more than the rated numbers (hard to believe there would be less than a 12% drivetrain loss, even if it was a 2WD).

But...I would wager that the kegger intake still kills a good amount of hp. Regardless of the dyno runs and who had what accessories on the motor, the 300hp crate motor is still just a stock 5.9 with a carb.