Do NOT use the heasgasket, you're wasting your time. I remember someone used one on their GT, regardless of how much he was told not to use it. He kept going on about how he was only running a small amount of boost, after driving it a new thread popped up by him saying he's ruined it again. The only response he got was 'we told you so'. The .6 is suitable for N/A, you've got a lower compression engine from factory, why ruin that and run low boost? It will be on the back of your mind always. Do it once, do it right. OEM or Athena!