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Having been fabricated from Nippon Steel, it is a definite that this exhaust will make significant power
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I fail to see how the use of Nippon steel will matter on the power output. The cross section of the tubing, bend radius, and lengths can all be achieved with a wide range of steels ranging from a cheap ferritic like 409 to a Ti stabilized 321 austenitic. The choice of material and service environment will dictate the longevity of the final product. This assumes a skilled craftsman is doing the work.
All of the above may be purchased from a multitude of mills in numerous countries.