Good day all. I just got a set of dual flo pro V force exiting out the back on my 97 Sierra 5.7l. Since the exhaust setup on that was already two pipes to the cats, no Y pipe, and its 2 pipes from the manifold back does that make a true dual? I didn't bother with the high flow cats after reading some of posts on the merits of it. I was wondering what kind of differences I might expect in sound or performance if I put headers on now?