Conversion Relay - Four to Two Drive, XY500UE, XY600UE, UTV. This conversion relay is most commonly used for (but not limited to) Chironex Spartan 500cc and 600cc UTVs (4x4/2x4 and similar variations), Xinyang 500cc - 600cc ATVs and UTVs (4x4/2x4 and similar variations).