newbie with lots of questions..

Default newbie with lots of questions.. Hi there, I have just bought my first audi (A4 1.8T quattro SE) and loving it already I have a few things I would like to do to it and could do with some advice. 1/ I was wanting to put on a boot lip spoiler and found a few cheep ones on ebay (see below) but not sure how good quality these might be. Does anyone have any experiance with these cheeper ones or am I better just shelling out fort a proper audi part? Audi A4 / 01-05 Boot Lip Spoiler Lightsilver met LY7W on eBay Body Modifications, Exterior Styling, Car Tuning Styling, Cars, Parts Vehicles (item 130140341874 end time 06-Aug-07 20:07:00 BST) 2/ My car has the 18 inch TT alloys on it but as it is an SE model it sits quite high and I was thinking of lowering it by an inch or so. Would I be able to use a set of standard A4 sport springs to do this or would I have to get a set of aftermarket ones? 3/ I was also thinking of boosting the power a bit. It has 163 BHP as standard but searching the net I found I can get 30 or so HP more from a chip or remap. I thought a remap for about £350 would be my best option but any advice is greatly appreciated! 4/ This sounds a stupid question but where is my arial?? The radio breaks up a bit which I thought might be a loose connection but am buggered if I can find my arial! (sorry for being thick!) Any way thanks in advance for any thoughts or suggestions anyone may have Greatly appreciated Cheers