How does one instal subwoofers in an Audi A4 1998?

It is a 1k watt amp, I've installed many subs in jeeps,volvos, hondas, just not an Audi. I've heard there is a weird thing you have to do with its amps. Can someone please link a tutorial on how to add speakers or subs to this car. If it is the basic set up wiring where you have the ground and a cable from battery to amp then that is okay. I just want to know if its more complicated then most cars. THANK YOUHow does one instal subwoofers in an Audi A4 1998?dude, i have a 2004 audi a4 3.0 and it is a basic installation i have 3 10in jl audio w6 powered by a 1000w alpine amp(the new ones) and 4 mbquart on all doors separate tweeter another alpine amp 150x4 kenwood receiver w navigation dvd and touch screen, it sound nice. i installed the whole thing myself. i even got two monitors on headrest. optima battery