Headers all the way.
There is something about the sound of headers that is just right for a musclecar. Stock Cast iron manifolds don't cut it and sound kinda boring and anemic.
I would argue that the rest of the exhaust system has more to do with the exhaust note than the minor difference between headers or cast iron manifolds. Usually most if not all of the exhaust system is changed when making a swap from exhaust manifolds to headers or vice versa so there's no apples to apples comparison.
The SuperCar and FAST cars running stock manifolds with free flowing exhaust systems sound anything but boring and anemic.
