I was wondering about this too, although my 7mGTE is a stock motor (approx 10,000 miles on the rebuild, stock turbo rebuilt at the same time) and has a stock headgasket (non-metallic). Wondered what would be the max turbo size I could go safely without worrying about the HG. (I am only looking at getting my car into the 350-450 HP max range really)
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