As you are aware, Yosh does make cheaper pipes, but their tri-oval retails for 71,000 Yen in Japan, but usually can be picked up for $550-$600.
My guess if Yosh does sell a cheaper pipe around $400, it won't have the true tri-oval design as the Monkey pipes do..
But, this is a huge step in the right direction. I'm working with Over Racing to develop a full titanium exhaust that should also come in over $400.00. I won't be selling them, just doing some testing.
Yosh pipes rock, and I would love to see some other quality Japanese companies enter the market instead of Kitaco and Takegawa.