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SD and SPG have been working on headers for turbo models and I was even shipped an SD prototype. It works fantastic but I'm told that it won't have a long life under high boost pressures. Turbo engines have higher EGT and almost any material outside of the cast iron will crack due to thermal expansion. Stainless steel is even worse than mild steel and the mild steel rusts quickly. This is why you won't find much on these.
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