I brought my car into the dealership today after hearing what I tought was a rattle/grinding sound in the the front end somewhere. They claim the rattle is coming from my belt tensioner since the 2.9 pulley is not creating enough tension as would the stock pulley. They said change the pulley and the noise will go away. Has anyone ever heard of this problem....? I'm going to put the stage 2 pulley on just to see and maybe prove them wrong.