Tyler, you are way way way over thinking this!! The standard old ball/spring type controller will work just fine. The diaphram is housed in metal that is bolted to the exhaust, however its a very high temp rubber. Every other type of waste gate out there just has one hose going to it, and nothing for cooling. It just isn't needed... I have been running that style setup for close to 2 years with no problem.
Jason
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