The idea that Harley-Davidson engines need exhaust backpressure to produce power is one of the most persistent beliefs in the ...

If you belong to the camp of people who still believe that back pressure helps your Harley-Davidson, or any engine, for that matter, we hate to break it to you, but you're wrong. Ask any engineer, ...

Add Yahoo as a preferred source to see more of our stories on Google. If you belong to the camp of people who still believe that back pressure helps your Harley-Davidson, or any engine, for that ...