I am getting ready to order CMI sport tubes and need to know what muffler to order. I want the quietest one available. Any input would be great.
Thanks

CMI Sound Elimination Mufflers. Most people with complain about them being too quiet at idle.

I wouldn't go with anything else but what griff said unless you went with shotguns. Anything I've ever tried that did much good as far as lower db also lowered top end.

I think I will go with turn down tips and add a GGB inline insert.
This was recommended to me from a well respected boat manufacture. They said this company really has the best out there. Has anyone tried the inserts? Just wondering what length to go with 8" or 16"? I would like a nice quiet 100MPH ride.
Thanks

CMI Sound Elimination, get the 6" diameter. They are good to about 750 to 800 HP in my opinion - about the same as Shotguns. They both sound good at idle and are fairly quiet. (I have both, but use neither any more as they hold the engine back some).
I have a set of CMI Sound Elimination 6" dia. clamp-ons for 5" pipes in great condition that I would make you a great deal on, say $400.

Give Graham a call at GGB he'll set you up. They're excellent!

do the CMI's rattle at idle

I have recommended quite a few boaters to Aqua Power Ltd. in Ohio and they have all had great results and no loss of power. I think these may be some of the best and I hear the customer service is excellent on an excellent product. Check em out.
www.aquapowerltd.com

Best Regards,
Ray @ Raylar

On of these products sure looks like the Gibson product.

Speaking of Gibson, anyone with comments about their product?

no, they do not rattle that I could hear anyway. shotguns do rattle a bit though.