I added the second pulley to mine in hopes it would resolve the minor pinging type noise I experience under no load 2100-2500 rpm.
I was very hopeful after coming across a video online showing how the belt can vibrate without the second tensioner.
Unfortunately adding the second pulley didn't seem to have any positive or negative affect and my noise persists.
Was trying to decide if I should remove the pulley but think I will leave it on for now as it doesn't seem to hurt anything.
My noise is not loud or obnoxious, almost sounds like the engine is purring under no load. (It does sound like a cat purring)
Like a soft rolling tapping noise.
I could live with it if I knew it was normal or not causing any damage.
It goes away under any load or below 2K rpm.
Have never heard a chirp from under my hood. (on this vehicle)
Here are the parts I used to add the pulley:https://www.amazon.com/gp/product/B000NSG1X4/ref=ppx_yo_dt_b_search_asin_title?ie=UTF8&psc=1https://www.amazon.com/gp/product/B008Y7P7OK/ref=ppx_yo_dt_b_search_asin_title?ie=UTF8&psc=1
It was an easy 10 minute add.