Headers vs 340 manifolds

I can't give you horsepower numbers or fitment issues because I have a b-body however I have a mild Street 360 Magnum and went from hipo 340 manifolds to flowtech long tube headers and I could definitely feel more torque seat of pants. At the time I was running flowmaster mufflers and the sound was too loud for my taste. I switched to dynomax turbos and have a nice rumble at idle and good bark when I hit the fun pedal now. I used remflex gaskets and no leaks.