More power everywhere!
Noticeable increase, not as much as the Heads did but definitely noticeable.
One of the biggest changes is it's much smoother and quieter.
The 340 manifolds also had a lot of drone noise from approx 1500 to 2000 rpm
I had to add 12" long glasspacks in front of dynomax ultraflows to get it to be tolerable.
Now it's so much quieter with headers I may take the glasspacks out..
