Smitty 19
The mufflers on Jack's boat and my stealth came from Raptor Racing silencers.
Don't know if he is still in business but his web site was www.raptorracing.com
Jack is running 1500 hp in his jetboat. You may have seen them on the pictures of our boats in last months hot boat artical on Beast of the East.
Don't know any thing about Zoomer Marine Mufflers but they advertise upto 1600 hp. Phone number is 886-496-6637 www.zoomersexhaust.com
Hope this helps.
Kojac