inlet location for mufflers

im still deciding which type of mufflers ill be going with but curious as to if you guys are running offset or center inlets on the square type mufflers, not the round kind.

Also what type of muffler would you recommend. Im running tti headers with cutouts so im debating on if i should go glasspack, aerochamber, or a turbo type muffler for when im not running open headers.