These are made of the same size pipe that my header is made from, and the megaphone reminds me of the one I had on my Goldstar. The sound of my current header & muffler is REALLY GOOD.
These systems look very good to me and I am trying to get a prototype made for the Savage to get a hands-on look & test. I will try to get Charlie (he has 3 Savages on the road now) to let me test this on one of his bikes if mine is not assembled by the time it arrives.
I have not heard back from the manufacturer yet so don't know what the time frame is on getting the proto. From what I could see of their work on the website it looks to be very good...virtually seamless from end to end and the prices were very good as well.
I managed to make mine over a period on weeks but I have not been able to recreate it since. My welding skills have gotten worse instead of improving over time.