I wasn't able to find the fullblown manual but it seems jdl and avo use the tb lines and leave the tb unhooked. Not sure I'd want to remove that functionality living in a cold climate.
http://www.ft86club.com/forums/showthread.php?t=50427
Am I right in thinking I could buy the forester xt pipe in the link above, and basically use the two connections (block and return added to the new fxt pipe) as feed/return? Leaving my tb as is?