I use a translator to communicate with you, and he doesn't translate technical terms very correctly.
1. Using a 2 in 1 exhaust adds a lot of power at low engine speeds. it turns out an exhaust with different lengths and it works like a power valve on modern 2 stroke. and it is very possible for a snow bike, the presence of power at low speeds.
2. I want to get drawings (drawing, plan, draft) to weld the exhaust myself. if someone has such an exhaust, then you can ask him to measure the length, thickness at different distances so that I can make a copy.
or , for example , a calculation table . something like this, only with the point of connection of two pipes into one.