I just popped another Elring head gasket yesterday. New bolts last time or maybe the time before that actually. I know what my problem is, it's that I don't have enough fuel for full boost in 3rd gear and not being quick enough letting off the throttle. I plan on rectifying this shortly. But since I'm going to have it apart yet again, are arp studs a worthwhile investment. Plus t'd B21 with k-jet 160 head.