Yes you can - If I can do it so can you, you need to create a stencil piece out of cardboard and glue - then shape it to your needs and cut it out from steel - weld and enjoy - Its a three piece design with a stinger on the end. The shape and taper of the expansion chamber should help the engine in supercharging the cylinder to above 100% air/charge load at certain rpms to give it the solid torque pull you need. Its not an imaginitive design, you would need to understand the port timing, port aim and duration to make a good chamber.
I left this because it was becoming a danger to my life - I also had made a Kawasaki GTO125 with reshaped inlet, flat side carby and expansion chamber exhaust, ultra stiff clutch with hydraulic actuation. That bikes owner crashed it into a car on the Super highway a week later.
I used to speed an RGV250 against turbo RX7s quite a while back, they did not stand a fraction of a chance once the suzuki screamed and I was upshifting gears - people said it sounded like
"A womans cry from the depths of hell"
2 strokes are addictive and become dangerous if you fiddle with them too much, they dont have engine braking and weigh next to nothing - Those two alone would give you the shivers if you do not survey the road before going full lock throttle on such a powerful 2 stroker