Heat resistant inlet gaskets

[loftylowe]

I've just bought a set of these for my matched inlets, when they arrived they came with 4 small rings made ou of the same stuff but I have no idea what they are! Can any body shed some light please!

 

[Jonny1*2]

they are ptfe washers. but to be honest you don't need to fit them. If you want to, which is frustrating, they underneath the plenum where the two 10mm bolts are either side of the coil pack.