Headers vs. Exhaust Manifolds ~ 'Let The Debate Begin'

A lot of these header vs manifold discussions are based on some dyno test of a typically low output engine, to make the argument that the manifolds are as good as headers. Like most things engine related, its all build specific, but a stock 2 barrel 318 wouldn't see as much gain as better built 360 for example in most cases. But take a 500 HP 408 stroker and it would be a much bigger difference.