Is it necessary to have aftermarket power regulator to have aftermarket exhaust on a fuel injected motorcycle?

[Adam]

I have been pricing different aftermarket exhausts for my 2008 Kawasaki Vulcan 900 Custom, but the salesman said I needed a power regulator or something since my engine is fuel injected. He said it is to make sure the right fuel mixture is injected since the new pipes will allow for greater airflow.

[don r]

Listen to the man. It's a balanced system. When you change one end the other needs to be changed to match.