We had various size Rootes type blowers at work and their intake bark could be worse than their exhaust bark without muffling. They were outfitted with intake silencers that weren't all that different than the exhaust mufflers. Since this type of blower is made in all kinds of sizes, say, 1-2 cfm to 1,000 -2,000 cfm a search should be able to turn up something that would work. Also, since most automotive type superchargers are of that type you might try a search for an automotive intake system, a junkyard would be a real good place to start.