Check out the thread below this one "Owners with GT6152's combo's and times please". Some people are running the E cover, the others have an S cover. I have the S cover version going on my car once the new engine is done. So far the people who have the 6152 are loving it......very nice street turbo. I'm hoping to have mine back up and running in a few weeks.....if I don't change my mind about the combo again....lol.