What does "below the curve" mean, anyways?[/quote]
Horsepower and torque are usually draw in a curve configuration relative to RPM's.
Power "under the curve" as I understand it means that the curve is drawn higher up on the chart therefore said engine has more power "below" that curve line. If the line was drawn lower along the coordinate axis, there would be "less power under that curve".
Someone jump in here if they can make it simplier.
As for the SC question of too much strain on a stock 6.0? The stock engine isn't "engineered" for a SC. Therefore, with hard driving the system will fail sooner than without a SC. However, 5-6 psi of boost with the Magnacharger, Whipple or the Kenne Bell (which by the way looks like the best set up in some respects) is not much as my stock Volvo 740 Turbo ran 14 psi with a little tinkering (it was only 5 psi from the factory).
You probably can blow darn near 5 psi from your mouth into a stout ballon before it begins to expand. No need for extra valve springs unless you like to see 6000 rpms alot.
Just my two cents.
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