I think most of us are using something aftermarket for the intake plumbing. I always found that the piece it came stock with got too hot from the engine and was not any real help for the passing of cool air being some alloy. I would try to avoid that stock piece if you want to push cooler air. Look C/F or even F/G if possible. Plastic should be ok as well. Of course the trick is, finding something aftermarket to work with the airbox. You will most likely have to do some modifications to a part. I believe my C/F intake was advertised for Acura/Hondas, and I cut/filed/modified the crap out of it to get it to work with the airbox. Of course, if you go with a simple short ram, it will be easier to find a lot of options. Just my opinion....
In any case, maybe someone here with the S/C will be willing to sell you theirs. *shrug*
Good luck!
Gary Noonan
'01 S/C VX / '18 Forester XT