Crate engines are a lifeline for street-performance two-wheelers and four-wheelers. When Harley-Davidson introduced the Screamin' Eagle 135ci Stage IV Performance Crate Engine in 2023, it wasn't just ...
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Do Harley-Davidson engines need exhaust backpressure to make power?
The idea that Harley-Davidson engines need exhaust backpressure to produce power is one of the most persistent beliefs in the ...
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