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It could but it shouldn't a head gasket can go for a variety of reasons...if your pushing more then 40 psi your pushing the limits but not necessarily gonna blow it
I've been running a PDRHX35 with a 14 wastegated housing for about 3 years with no problems to date. I see 35 to 38 psi of boost on a dyno - you can look at my sig for HP and torque numbers.
Stock timing. anyone have any problems with the extra boost and an exhaust brake? I have a (I think factory option) jacobs extarder remote( about 6-8 inches past turbo).