What engine have you got? I remember seeing a pic of a 115PD or 130PD engine bay, and there was a lovely shiny pipe coming from the back of the engine, down the left hand side and then to the SMIC. It was an uprated pipe (instead of the cack plastic one)! Anyone know what I'm on about?
http://www.golfgtiforum.co.uk/index.php?topic=89491.0Many topics in the maintenance section with lots of helpful hints, tips and guides. Shame nobody ever looks in there