how about these IC's...
I saw a link to this site in a guy's sig on Vortex. He said they have a great selection of couplers etc, which is true, but are their cores any good? I'd speculate they're typical chinese stuff like off eBay.
http://www.siliconeintakes.com/index...2d67b3a7609672
http://www.siliconeintakes.com/index...2d67b3a7609672



