So i have had Two Cometic head gaskets blow on me now and have been using the ARP studs both times. Both times the cometics have blown the car has overheated and will only overheat if driven in boost even for a short amount of time. Would this be likley to happen using these parts? I am getting The HKS gasets and L19 studs this time, do you think that should fix the problem?

 

Yup. There is quite a few post on here and on my350z about cometic gaskets. They are no good. HkS and the L19 should solve your problem. In my opinion.