don't forget to block off the rubber tube a long screw should do, and secure it with a cable tie somewhere.
but remember theres a flappy thing inside the pipe just like the carburetta flappy thing and this will rattle till it gets fed up and passes onto your CAT where it will stop may block things or pass into silencer
don't know this glass roof thingie, but two sink plungers?
If you have a heated rear screen be sure to disconnect that as well or you will break the connection and it will need soldering back on..
I know as I did
I find the easiest way to keep the rear of the hood from dropping on your head is to fold it forward then wrap a long cable tie around the frame just at the rear of the driver side window. Some use bungees, but there is always the risk of it twanging off and hurting you.