Here are a few pictures that put the differences between the stock system and the torque Tubes into perspective.
First up we have the left side manifolds.

Now for a peek at the right side units.

And now the big crowd pleaser, our old beloved stock "T" pipe and it's new replacement. I am a much bigger fan of a fat Y than a skinny T.

This shot shows the interior of a stock manifold at the fifth inlet port, the interior rectangular space gets incrimentally larger after each additional port joins the flow, so this spot is that area at it's largest dimension before it flares out to the outlet nozzle. The space here measures .75" x 2.5" or 1.87 sq/in of cross sectional area. The Torque Tubes have 5 primary tubes each with an interior diameter of 1.5" or a cross sectional area of 1.76 sq/in (5 x 1.76 = 8.8 sq/in). Granted they both dump into a 2.5" or 4.90 sq/in tube at their collectors then into a 3" or 7.06 sq/in main tube to the cat. I think the new tubes will let the motor breathe easier.

I now have to look busy for a while, I'll be back soon with the installation.