No Clue I have gone WOT about 15 times And 3 times when under boost it Pucken Coolent out the Resovor cap. This only is coused but overheaten or Blown HG. Car never overheated. I heard ZERO Detanation. A/F is Safe 11.3. I think is that we forgot to RETQ the ARP heads studs. But were 90% sure its a HG. I thinks it lifting the head under boost. Were going to pressure test it Sometime :'(