Not to step on any toes, and I may be way off base here, but traditionally...

N/A Cams in reasonbly high performing engines ended up with additional overlap and longer durations than there turbo brethren. In fact, in the Toyota world you could pick up a number of ponies by switching Turbo cams for N/A cams in the turbo cars. Unfortunatly the overlap created blow-by and a loss of low end torque, but top-end performance increased significantly.

And conversely, i've personally watched an N/A Celica make a dyno run with Turbo cams and pick up 3-4ft pounds of torque in the bottom end, but lose more than 10hp by 5,000rpm.

What portion of the turbo cams are more agressive? More lift? Duration?

Paul