Yes its diesel, now cry u lost
All i can say mate is ebay. Look for Halo front lamps, i have these on mine, they got Xenons, angel eyes and are black inners. For the rear FK do a nice set. (as shown on my car some where on the forum)
If its a N reg car, i would crawl round it and check all the commom things like Front arms are not worn etc B4 you start putting S4 bits on it. Finding Genuine S4 Parts is a ***** as well, When you do find em they aint cheap.
hope this helps... and welcome to the forum!
Now to many mods to list! Lots of power, torque and Leather!