MUST READ for DIY sound system improvement

[peppernick]

EXCELLENT article. The info on here is all you need to create a fuss free, affordable and quality intergration of aftermarket amps/speakers with factory headunit.

Great Article (http://forum.e46fanatics.com/showthread.php?t=245914)

[Afif]

yea ive had that saved on my hardrive from ages ago when i was looking to upgrade :D. REALLY useful.