Hi there, I've been down to my garage to have a look at the pipes on my engine, I'm not sure if it's the same as mines is a '92' v1 but here goes, 1 goes to boost gauge and to solenoid, 2 goes to dump valve/recirculation valve, 3 is the crankcase breather pipe, 4 to dump valve/recirculation valve mines is blanked off because I have a dump valve fitted, 5 not sure as I don't have that port on mine,6 cylinder head breather pipes, 7 I think loops to the map sensor, 8&9 go to 2 little pipes which run under the inlet and go to vacuum pipe at throttle body and to the pipe to the right hand side of pipe 1 when looking at it from the front or the n/s if you were sitting in the cab, I took these pics if they help.