i combined 2 wrx splitters, aluminum bits from lowes weather stripping and a garage door seal into a sti tmic sized splitter. mine has a mid splitter vane and i also sealed all seams with black atv. also used foam to seal splitter against hood scoop top and sides. one problem was tmic was not parallel to hood...solved that with different sizes of gasket materials.
enjoyed the challenge and made a nice piece.