Indeed, the "output" pipe is not connected to anything - neither the exhaust, nor the radiator pipe. It's just left on the loose. The input was somewhere under the seat, i.e. inside the airbox. Thank you very much for the assurance that I can reduce the wieght of the bike by removing this "system".
I'll also check the colour of the power valve.
One question more: are there any limiters or something in the carburator I should remove also? The bike came with additional jets and needle, but I still haven't opened the carburator to see what's inside.
P.S.
This is the first (and so far only) GasGas bike of the "dealer" I bought it from, so we're on the same spot in the learning curve.
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