Intercooler Plumbing

[Eatoniashoprat]

Can anyone give me some advice on building intercooler plumbing?

I'm using the stock wrx intercooler mounted horizontally over the engine. The problem is the intercooler has two intake holes. Since I don't have a spool gun for my mig to weld aluminum I was just going to make the flanges and the pipe out of steel/thin exhaust tubing. It basically just needs to come out of the turbo, make a 90, make a y, then into the intercooler. Is using steel a really bad idea (rust/heat transfer?)? I can't use the original aluminum subaru flanges since they are pointing the wrong direction. I also can't find any aluminum y-pipes. If I could find one of those I could just make the flanges with short pipes sticking out of the intercooler and connect the rest with silicone tubing. Any thoughts/pointers? I'm not too sure what to do here.
THanks,
Mike