and also whats difference between the part # he gave me and this one
http://cgi.ebay.com/ebaymotors/FLOW...tegoryZ33636QQihZ003QQitemZ130023858908QQrdZ1
you got it, the inlet/outlet design. You can use a center/center muffler as well, but they will hang down and you will see them, that is why I always suggest the 549's