I’ve done an article for StrikeEngine. It’s an exhaust calculator, you enter the power of your engine and it spits out an exhaust diameter.

A video summary of the calculator on StrikeEngine.com

A key point with the calculator is to note the exhaust speed it gives. If the exhaust speed is exceeded for the recommend diameter, go to the 20% larger size.

There is an alternative calculator at the bottom of the page. But I explain the relevance of that in the article.

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