These thick wall stainless steel pipes from Aeroflow Performance are the same material tube used in our Boosted range of stainless-steel turbo manifolds. We offer a range of different bends and straights in 1-3/8? (35mm), 1-5/8? (40mm) actual Inside diameter. All stainless steel conforms to the high standards for pressure so it?s great for high temp applications. This will allow the end user to build their own turbo manifolds, crossover pipes and wastegates extensions. Our stainless-steel pipe features a smooth inner surface and gradual direction changes in our angles help reduce the pressure losses and turbulence.