| Most people, when they think of stainless steel, they think of kitchenware. 304SS is typically the alloy used for those items and if mistakenly used in the hottest sections of the exhaust, it will cause a problem. 304SS sucks for anything other than kitchenware. At the temps it will see in exhaust systems it WILL rust up and give you problems. When I R&R'd the exhaust this time around I used 316SS for the fasteners. 316SS has really good oxidation resistance at temps up to 1600F and I've used it extensively in my jet engine projects for the hot section fasteners as well as some parts such as the nozzle guide vanes, jet pipe, etc. It is always a good idea to use anti-sieze on all of your fasteners in the exhaust - even with good stainless there's no exception, especially in the cast iron turbine housing where the casting will rust. You just need to make sure you use a higher grade of stainless steel and you wont have issues. There are two studs in the manifold flange and 2 bolts holding the turbo in place. The turbine housing has 3 studs and one bolt that hold the downpipe in place. The pictures you are looking at were taken bedfore I had all of the new fasteners in place. 316SS lockwashers were also used on every one of the fasteners. FWIW, the factory nuts that hold the turbo to the manifold are stainless steel, not sure what alloy, but they aren't 304. :)
Enthusiasts soon understand each other. --W. Irving.
Are you an enthusiast? If you are out to describe the truth, leave elegance to the
tailor.
Albert Einstein
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