diceman - I think it is 2 x 2-1/2 in and 2-1/2" out or it might be 2 x 2-1/2" in and 3" out, I don't remember. It has a nice rap to it and I had an exhaust shop here in town do it. Only 3 pieces of pipe with mandrel bends.
One unforeseen snafu was that the headers had an offsize 3-bolt flange and I had to run back to my shop and make them from scratch while the truck sat on the lift. The photo is also a link to the webshots album showing different views.
The truck looks basically stock as long as you don't open the hood or look underneath - but it can run at freeway speeds all day long effortlessly.
