Hey!!
I resemble that remark! I'm 62.
But, most header systems are built with production in mind and not ultimate flow. Most follow the 'if some is good then bigger is better'.
A well designed header and exhaust system will outflow stock manifolds and pipes for sure but most are not designed that way. Too big of a primary pipe, wrong collector length and size, wrong exhaust pipe size, poor muffler design and placement, poor tail pipe design.
You don't need 1 7/8 primaries or 3 inch collectors or 3 inch pipes with mega sized mufflers.
You need a balanced system. You want to get the exhaust out efficiently while reducing backflow. In that regard stock manifolds and pipes will likely outflow most bling bling header systems out there.
And if you want a little more flow from your iron manifolds, just extrudehone them.
http://extrudehoneafm.com/fuel_air_management.html