you can make your own out of some planned couplers and bends... or pay out the nose for a premade one, which doesn't come with the section cut out for a MAF, but nearly always has a location for a BOV.
everyone runs the MAF on the cold pipe if they relocate, and we pretty much all adapted a piece that wasn't designed for a relocated maf. most guys who do it do it with a BOV as well.