For mufflers, I would talk to Rexone here on ***boat. He is the one that would be able to point you in the right direction.
Right now, from what I have heard, they are not cracking down too much on noise at Havasu. Parker they are going nutts, but not Havasu. Your exhaust is under the water when off of plane so I don't think that you will have too much problems until they start cracking down heavily. Unfortunately it is coming.
Ron Gibson is the owner of Gibson Exhaust. I saw his exhaust system @ the Heatwave Poker Run and it was trick. His pipes come out the back of the boat and instantly turn and go straight down below the water line and blow straight down. His boat was not loud at all. I was surprised when I heard that thing. Actually I was kind of dissapointed because I love a loud boat, but I guess I am different from those who make the laws. http://www.riverratlife.com/forums/b...lins/swear.gif