You need to pressure test some piping ,intercooling etc
I use a top of a drinkflask where a bicycle pump can be connected en put it in a certain pipe track while blocking the other end off with the other half of the flask seated in with a clamp.
A weak point is the silencer rubber orange seal, it tends to rupture its located under the engine at the back.
But also a hose or pipe can be split or a loose clamp
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