i ALMOST NEVER RECOMMEND MUFFLER PRESSURE on CL stunt setups, Pressure makes everything worse, and makes the engine dumb where it does not respond to attitude change
If any leaks the become large problem,
if line slips off lean motor burn run
if line cloggs lean motor burn run
line slowly clogs makes for bad needling
trash burned carbon flake sand dirt etc can go thru the exhaust and ne put into the tank
you are filling the tank with massive bubbles, and hot gases, and burned fuel
there are many more
Randy