As the title states....its a tube that connects to the intake tube toward the backside....I noticed it and connected it back.....but when I drove the car it felt alittle sluggish and slower....disconnected it again and it runs like a champ and noticably faster....what is this peice and why is this??....it goes along w/ some other lines......Ill take pix if necessary.....Im assuming the previous owner did this, otherwise I dont see how it would pop off???....JT