HypEX SS-347 exhaust manifolds are investment cast from 347 stainless-steel due to its vastly superior performance in high-temperature applications compared to commonly used materials. All components, including pipe elbows, are unique to Hypertune and are designed specifically for extreme-duty exhaust applications. **We do not use off-the-shelf steampipe elbows**. This allows us to offer a high-performance manifold that is light weight and extremely durable.