I have a 2000 28 foot Active Thunder Savage With 500efi. I'm experiancing a list to the port at most all speeds in calmer sea's and porpoiseing, Im wondering about going to a right hand prop maybe 5 blade, Any sugestions? Also has anyone ever tried an extension box on one of these boats?

I had a 12" stelling box on a 25' Active thunder Tantrum which I removed because I thought that it would help with porpoising. It didn't really make a difference. In my case I seemed to pick up some speed and the porpoising remained the same. I purchased another Barvo 1 and had some work done on it by Merc and that seemed to help me a lot. I didn't eliminate it but it reduced it. They told me that if I had the prop barrel machined down a little that could help with the porpoising.

Did you have any work done on the bottom of your boat?
Hook removed etc?

I have not had any work done on the bottom, However i did enquire about removing the hook and was told removing the hook may make the poripesing worse. Did you try a noze cone on your lower? Do you think that would help?