I myself would not consider running anything but the Stainless Marine. I have had great results with all their exhaust. Two months ago I picked up 3 miles per hour and had to reprop with the 5” over what I was getting with Lightning Headers on twin 800’s in one of the 28’s I built years ago, “Untamable”.
For your 330’s I would suggest the DOMINATOR. Installation is a breeze and the work.