(The Vectra C part# is: 9231937) This pipe, the first one, will fit with no problems. It comes with NO holes in. I had to drill the hole for the air-temp sensor and modify the fuel pressure regulator take off pipe. I wasn't really happy with it when I first done it so I looked at the other pipe (Part# 9177095) that was available which had a place for the fuel pressure reg pipe and it had a hole for the cam cover breather if I wanted to use it. I blanked off the cam breather hole in the pipe with a rubber grommet and attached the fuel pressure reg take off pipe.
I have since moved my fuel pressure reg pipe to the take off on the inlet manifold and now blanked off the hole that was left. Basically both pipe will do the same job but I was experimenting.
If I were you I would go with the 1st pipe. Fit a small breather filter to your cam cover breather pipe and relocate your fuel pressure reg pipe to the inlet which we can do for you on the weekend when you come to Daz.
Have a look here about the fuel pressure reg pipe relocation. Its 1 minute job.
https://z22se.co.uk/viewtopic.php?t=5580
See here for breather filter. http://cgi.ebay.co.uk/Breather-Filter-S ... dZViewItem
