[blykins]

I agree Dave.

Engine builders have to sell engines and the numbers tell the story.

I do have a few of my engines that go to the drag strip though and there are rough calculations to see if the engine is really making the power it's supposed to make based on ET's and trap speeds. So if I provide a dyno sheet that says 600hp and the car runs a 9 second 1/8th mile.....something's wrong........

I do believe that a Cobra eats a little more horsepower than the usual application. A Cobra exhaust (with collector-less headers that have sharp 90° bends at the end going into golfball sized mufflers) consumes a LOT of horsepower.