Ryder Racing Phenolic Manifold Spacers 8mm PAIRWhy do our spacers look different? Made from the highest grade of FR4 Garolite composite our spacers were created using a version 1 4 WRX inlet manifold, this allowed us to create the best port flow possible and increase the VME (speed) of the rushing air. Our competitors simply send inlet manifold gaskets to China and duplicate it without any other thought. Using theirs wont allow you to align the spacer to get the matching port required for high HP