Try www.roadraceengineering.com they specialize in DSMs and sell some piping to convert to a Star/Quest FMIC. They might have some 2.25" and 2.5" mandrel bent pipes under the Do It Yourself and Hacker and Tweeker section. You'll see what I mean, give it a shot. Later.
Actually, you may be able to get away with teh FMAX piping. You may have to modify it a little, but it should work! What turbo are you running? If you are running the T25 or T28 you will have to do a little more modification.