Cool to see what goes into fabbing up a cone pipe  sweet!

Making your own silencer also?

Well I'm fairly certain the pro's are using software to generate a 3d view of the pipe, then generating an exact flat layout. From there you can use a bandsaw, laser, water jet, etc to cut the pieces out precisely. After words you roll them into the individual cones. That would be easier if I had the software to generate the view and flat layouts. All I have is a minor in math, and an old triangulation method sheet metal layout book. The tapering elbow triangulation layout is a PITA. So I didn't do it. I used a brute force trial and error method combined with 20 years of fab experience....not exactly the ideal setup, but it worked for me

On the silencer.....Sorta....not really. I had a pure Polaris dual exhaust setup off of my 525 irs outlaw that I am no longer using. Each silencer was almost the exact same size as the silencer hall made for my HPR19. Luck I guess All I had to do was make a mounting bracket.