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That Dyno is probably malfunctioning. The graph should show about 429hp, not 443hp. In any case, before starting to question the 505hp of the 2.9L V6 engine derived from the F-154, check the accuracy and maintenance of the Dyno you used. The QVs that we all bought were equipped with 505hp engines. I hope your came with the same engine.
In EU the engine is 510hp. ;)
 

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I think in the EU your engine is 510PS, a non-sense unit also known as metric horsepower that is used for some reason in modern car engine ratings. It is the same as 504HP (google says 503HP).
The meaningful unit to use in the metric system is kw (kilo watts). The QV engine has 376kw output. If you use that figure together with metric units for weight you can compute expected performance with no magic numbers for units conversions.

In spite of several attempts to convert the USA to metric it seems all that has happened is Europe has adopted pseudo British units. It makes no sense to me.
I agree
 
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