Hey seems they are discontinuing the regular 40 series Flows according to a Summit rep I talked to. Just wondering you got the Deltaflow 40 series don't you? I know yours is single in/dual out though right? Does it sound aggresive? I mean does it really grab you with that V-8 attention getter. I was thinking of putting on 12" 'packs on my 355 in my Chevy when I get the headers on, but my exhaust guy told me the Flows would only be $20 more. So I started check'n around on prices and called summit to see if they made a center in/out and they don't in the regular Flow but they do in the Deltaflow. I just wonder what those Flow's will sound like on my carb'd 355? I want LOUD but I'd like nice sounding LOUD. Let me know know about yours. I really want to know what yours sounds like when you really HAMMER IT!! Thanks