Non HK/NAV e46 m3 speakers upgrade
I'm looking at upgrading my stock Business HU to a nav. I'm looking at dynavin d99 or is there a better choice? How about speakers? Never done speakers so i would need all the belp. I dont know the specs of my stock speakers 06 M3
Brand of speakers
Special mounting for our speakers?
Amp. How many ways?
Type of speakers? Seps?