inspected it for cracks and splits before fitting it and I've used black silicon sealant everywhere I found any signs of light from the torch I was shining inside and thought it best to redo the seam all the way round it. I have also put a bead round the rivnuts that hold it to the wing and a dolop on the holes before screwing the a pillar bracket to it so the main body of it I am confident is sealed it's just the pipe from the body to the airbox that I need to seal now. the only other point that I am confused about, due to many different opinions and my understanding of how it works, is does the rubber 'dump valve' valve need sealing or, as I understand it, does it self seal when the engine is running?