Just had a search... and all I can find on this is the part numbers and how to install it....
Im presuming it's a feed pipe from the bumper to the air box, then from the box to the intake.....
But what cars will it fit on.... and is it worth doing?
or does it all ready exist on my Leon 110 SE?

Im presuming it's a feed pipe from the bumper to the air box, then from the box to the intake.....
But what cars will it fit on.... and is it worth doing?
or does it all ready exist on my Leon 110 SE?
6LL 129 621 - bumper end connecting bit
6LL 129 618 - main pipe from airbox
Instalation:
Referring to the parts as:
Front inlet -> Adaptor -> Pipe -> Airbox
...where the Adaptor & Pipe are the bits being changed, this is how I did it:
1) Remove cross-head screw from airbox, pull old pipe out of airbox so the end is free
2) Remove 2 torx screws from front inlet, lift whole assembly out.
3) Prise front inlet off of old adaptor & hose. Chuck the old adaptor & hose.
4) Fit new hose into airbox and refit the crosshead screw
5) Clip new adaptor into front inlet
6) Refit front inlet & new adaptor using 2 torx screws (whilst pushing new pipe down out of way)
7) Bend the new pipe over the new adaptor and push together, pretty fiddly, requires a fair bit of bending of the pipe (which is quite flexible).