These are a brand new kit that I had made in hopes they would fit my 06 but the power steering pulley is press-on whereas my pulley on the 06 is bolt on.The manufacturer only had plans for 02-03 pulleys,I assumed they were the same so without looking into it I had them made. From what I understand they are not underdrive. They are smaller but the ratios are kept the same. I would like to get 150.00 shipped. I have 2 sets as my friend with an 05 STi wanted some as well so I ordered 2 but neither of us wanted to mix stock pulleys with the aftermarket ones.