i was talking this over with Blazen and we agree it could be your gostago fillerment enhancement intake and also ur underside sliding recoiling system that mustangs were fitted with for the new A.E.I.O.U toxic gas standards.
nah the Flaminhiemr valve is notorious for the long "slaaaarggggghhh" sound, the hiss coulc be a tire puncture that was suddernly plugged by sumthing on the inside of the tire, or it could have been the pressure of the G9 bottle for the Mobat converter
Interesting Idea, but the gas from the Mobat Converter is Highly flamable, If it was leaking surely it's only a matter of time before his car bursts in to flame and the explosion is seen for miles. Man I'm glad I'm not where that guy lives
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I'm not having fun anymore, cya later on. Take care.
thanks guys for all the help and suggestions, tomorrow im going to take it to my buddy who is a mechanic to see if he can diagnose it rather than try to do it myself, or worse, take it to the dealership where they will charge me for just looking at it. those bastards. thanks anyways guys, and i am no longer seeing that girl and the stang still hisses so idk haha lol