The only Magnus manifolds I ever bought (1 Evo, and 1 STi) both looked like a little kid made them and I was embarrased to sell them. Metal stuck out into port areas, the welding was horrendous looking and had pinhole leaks all over, there were awful steps from the runners to the flanges that met the intake manifold etc.
Granted that was a couple years ago and I haven’t seen one since because I refuse to sell them. I can only hope their quality has improved.