First my sump question. I know that the mk4 had a ally sump so was very weak and if the car was very low could hit the road and smash.
Now is the mk5 the same? Or are they cast? or not as deep as the mk4 ones?
The Mk5 GTI also has a cast alloy sump, but they arn't the lowest item at the front. You'd scrape the bottom of your front spoiler first, and then probably the front alloy subframe and exhaust cat.
And lights how oftern do Xenon headlights come up for sale. It is the one thing that i am missing from mine that i really want.
Not a good idea to retro fit Xenons/HIDs. Even if you get the genuine headlamp unit, you will still need front and rear level sensors, headlamp washers, and the controlling ECU. Without the complete set up, then the car will be illegal. As for these crap kits which retro fit a HID capsule into the existing halogen headlamp - well, they are totally illegal, even if you have washers and auto leveling. This is clear, factual info freely available on the Department for Transport website.