I would like to use one of these wrap around header with the original pipe. does someone already made these experiment?

Here is an example of a canister fitted with the KS header system. For the 26cc you need 22mm elbows.

Thanks for the answer: I would like to use the header that in krumsheid site is called double bent and transform a side exaust in rear exaust, these header looks redy to use and seems made of a single piece of inox tube.

with the fixed header the pipe will run at exhaust port height, and you need a tunnel in the hull. total header length should not differ from the supplied MVVS. It may be slightly longer if you do not run the engine beyond 8000 rpm.

these fixed hader allows the pipe to stay exact behind the cilinder ?