I think the dual plane "stock CUCV intake" sits a little tall for this set up, but I'm not sure.
The diamer of the inner circle on the aluminum intake is 6". I used whats called a drainage basin slightly modified for this. I got all the parts from the plumbing dept in Home Depot. the black rubber part is a 4" coupler that I had to strech around the larger diameter of the "drain basin".
They sell 1' x 1' x 1/8" rubber sheets for making gaskets in the plumbing dept as well, I just put some used oil on the 6" diameter part of the drain basin to mark the rubber sheet. I used a utility knife to cut it out and used it to seal the surface between the drain basin and aluminum intake "brownish red in the picture"
I used some "Allthread" and wingnuts to secure it "I don't remember the size, possibly 5/16". cost is about $25 in parts not including the air filter...
Personaly I picked up about 2mpg increase and a little more power in the butt dyno dept. "results may vary"
As far as the sound I couldn't really tell you because I did a lot of other sound proofing at the same time?? but it is quieter!! I do plan to coat it with something in the future...