Super Flowmaster 2 chambers?

they should be slightly slanted but they're not flat. Offset means the piping doesnt go dead center of the side of the muffler, either left or right depending on what kind of vehicle you have.

I have em, never had the originals though. They are supposed to be just as loud as the originals but sound like the Delta's inside (not as much drone as the originals)

Super Flows will give you the same sound as the old Flows but with less drone inside the vehicle...believe me that's a good thing. I;ve heard both on the same engine and it sounds the same. You'll love the sound...myself, I'ma aSpintech fan, but I'm not dissing the flows in any way.

Offset inlet/oulet refers to the position where the pipe enters and exits the muffler, it's mostly for fine tuing applications for specific models of vehicles in order to fit...this does not affect sound. Enjoy your new muscle sound man and keep a light foot around cops.