I've heard from my Bosal rep. that the cat has a two bolt flange, whereas the B-pipe for the Federal is a three bolt flange as well as the mid pipe's flange. Therefore, it is not as easy as you think. In fact, it would not work, from what I have been told. Make sure you talk to an authorized Bosal distributor before you jump to any concluisions.
See ya, Rishie
See ya, Rishie