Who is useing Header extensions?

The extensions help low end torque. We knew this for decades. It shows up in the 60’ time, time and time again. I was always told as a kid, start cutting them down 2 inches at a time until the 60’ looses time. The you know you went to far. This is also where you add in the pressure wave cancellation box for the muffled cars.

Can all cars use an extension and to faster? This I do t know. To many builds on top of to many variables to state that an engine will be better with this or that. The race track will tell you what the engine likes in place of a Dyno.