I'm not exactly sure, but I think that the pipe releases in a way similar to the brake booster line, ie. you push in a ring to release it. Don't take my word for it though, my memory is a bit foggy!
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James now has: 2008 987S 6 speed
Crashed: 2010 987.2 pdk in speed yellow! 
Sold to a cool racer chick: 2004 986 S
YouTube channel: the PORSCHE as seen by NewArt
www.youtube.com/channel/UCohdrH2xHTklM1thxk0KKOQ?
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