Just got header done and had Stromung for several months. Sounds about 15% louder on all parts of the rpm range. Same tone, more volume no rasp. Lots more pops and gurgle on decel. The header also added some surpercharger type of whine in the mix at WOT. Love it. Love it. Revs much smoother and fast as well.
A much better setup for me than the previous Magnaflow I had.