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The 4.5 in the Q45, FX45 ect is really a high tech high performance car engine. It is made for high RPM horsepower not low end torque...although it does max at 333ft-lbs I believe. It is higher in the RPM range and is not suitable in a vehicle like ours.

If you were to make similar modifications to the 5.6 we have it would 1: be very expensive and 2: would still not be suitable for a truck

Unless you were a racer and not into towing. they use the lightweight valvetrain and higher compression so they can achieve the higher RPM's. That is where the horsepower is in that engine...again not useful in a truck usually.
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