Universal Air Filter fit

[Toms306]

Finally, what is this extra bit on the right that connects to the air box? Seems something to do with oil? I left my handbook in Surrey so I can't look it up.

That's the oil breather pipe...the bit that dirties your filter lol. TU engines seem to chuck loads of oil through the breather so you can't just leave it open (I did and ended up with a bay splattered with oil). Your choices are to add a long pipe onto the throttle body for the cone, then make a hole and stick the breather into the side of that pipe (how the induction kits do it) or to add an oil catch tank to it instead.