The idea that Harley-Davidson engines need exhaust backpressure to produce power is one of the most persistent beliefs in the motorcycle world. Riders who bolt on straight pipes often report a loss of ...

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 ...