an ITG filter can be purchased from
http://www.parts123.com/PartFrame.asp?ZTM=cadeghda&GHOME=www.coastfab.com&TITLE=Coast_Fab
also you are gonna have to verify, because i think ITG has an aluminum female position at the end... if this is the case, make your pipe around 6inches or so and go to Home Depot and go to the plumbing section and get a 3"-3" adapter (they are short, good quality and cost maybe $2-3)

Aim:ZoltanS4