Matt, if you go to a Harley swap meet you'll find lots of stock Sportster mufflers. They have 1 3/4" inlets and are quality pieces and quiet too.
Check out these ones.
http://cgi.ebay.com/ebaymotors/ws/eBayI ... &viewitem=
Check out these ones.
http://cgi.ebay.com/ebaymotors/ws/eBayI ... &viewitem=