Jan, OK, it,s clear now.
I work with MTW parts, he calls "knuckle header". It is a 28mm diameter header of thin stainless steel with 90° bend and two ball joints that can be adjusted and soldered after the canister is fitted in place. Much better than flex tube which always leaks.
7.5kW would be wonderful power on canister. It is what 85cc gets on tuned pipe.