I would agree. From the Flowmaster site,I can't remember the cut-away exactly, but it seems the 40s didn't have much in the way of baffles. If the 44s are less baffled they'll be boomier (is that a word?) And fargin' loud. Is that what you're looking for?
I like the throaty, loud exhaust, but my inline six still sounds silly with a free flowing muffler. I run a magnaflow that I really like. Almost no sound until you drop the hammer, then it sounds really good(for six cylinders of fury).