Can anyone confirm that according to what I believe is a very solid knowledgeble 300zx TT owner/mechanic that the throttle suction valve behind the glove compartment related to the A/C system is totally unnecessary and that you can eliminate it and just connect the lines together and let it run without it. He said Nissan no longer installed them on subsequent Z's (350's & 370's} ie.... it was overkill." Many thanks!