Who is this Nick Waple? Why has he just been increasing the area of the "outlet" of the intake? Or am i blind? Would generate gas velocities worse than original at same gas flow that... Well, otherwise nice, besides that i dont like the idea of o-ringing against the head, all of the heat from the head is transferred via the material into the intake.

Hexxon,
Nick supplies the flowed YB head and inlet as a matched set. The "O" rings are indeed neoprene as Bill said.

The problem with the standard gaskets is firstly they have to be "opened up" to match head/inlet.......and with big (ish) boost engines (2.5 BAR) they can blow apart/break up over time