These steam pipes from Aeroflow Performance are the same carbon steel material pipe used in the Boosted range of turbo manifolds. Aeroflow's offer a range of different bends and straights in 1-3/8" (35mm), 1-5/8" (40mm) actual Inside diameter. All steampipe 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. the steampipe features a smooth inner surface and gradual direction changes in the angles help reduce the pressure losses and turbulence. All steampipe is sandblasted to a raw finish so you can weld them straight out of the box.