Im trying to put GSXR1000 ITBs on a DPFI flange; problem is the ITBs dont really line up straight, and the runners are small on the DPFI flange. I dont really want to use spacers because it looks like I would have problems with the bolts that hold the itbs together(not long enough). My solution is just build custom runners that "offset-taper". I'm trying to figure out how to build these though. I have access to a lathe but that wont work because the runners wont be round. Only thing I can think of is CNC($$$) or cast runners. I cant afford a CNC'd part right now, so I want to try cast aluminum or steel. Problem is how? I thought about making a clay cast(one for the ID area, and an outer cast), and using Devcon liquid aluminum(ive never used this before); and throwing some salt on the ID cast to create pores. Will this work? Any other ideas(Ill make a little Paint drawing)?