hey,

if you were arming up the pneumatics and you say it made a louder noise when u pressed the dump valve, why is gass escaping in the first place?

are you saying you armed up sf to do a flip and theres gas escaping?

or when u do a flip the escaping gas sounds louder?

or are you on about the noise of gas comming out the bottle into the pipes? if the valve is open you will hear a kind of hissing where as if its just going into the pipes it will sound windy as if the hissing is muffled- make sense lol:P

i recommend having a pressure gauge anyhow as then you can tell properly what pressure your running at and if u arm up and then turn the bottle off you can tell if its holding all the gas or if theres a leak somewhere