subs for my audi

Hey i have a quick questions before i get subs to put into my 97 A4. first of all, is there any weird quirks that make it hard to put subs in an A4? I mean is it just like any other car or is there something that i could easily screw up if im not careful? And do you think $200 for 2 12'' kenwood with an amp running at 620w rms in a ported box is a good deal?

Trunk cars can be difficult to get bass from the trunk, think about how you are going to get the bass into the cabin before you even start. Don't know much about Kenwood, try googling the model #'s and see what everyone else is charging.