Can anyone tell me what the foam insert in the engine undertray is for. Mine is oil soaked and becoming a health hazard ... do I need it ... if so what is a good replacement?

Jantec1

I would have thought purely for noise deadening......the early cars did'nt have an undertray at all - so you could dispense with it altogether if its that bad I suppose.

I have a spare undertray if you need it!!
It's used, but NOT soaked in oil. Came off an RB5:)

Iain.

it is to stop small stones lying on the guard,in case you ever ground the car allowing the small stone to puncture your sump :eek: .

Sound like I ought to replace it ... anyone know where to get this heat resistant foam?

Not sure where you get the foam from, can you remove the guard and clean the foam?, maybe try a dealer (Subaru that is).
The guard also stops the heat shield from getting wet and getting fragile to the point of an annoying buzzing sound.
Cheers.
Ian.