HI
THIS IS MY FIRST POST, I AM EXCITED TO HAVE JOINED

I JUST BOUGHT A 2000 BMW 323i AND I HAVE SOME AUDIO EQUIPMENT (LISTED BELOW) THAT I HAVE SOME QUESTIONS ABOUT

1 alpine mrp-m1000 amp (1000rms @ 2ohms)(600 @ 4ohms)
1 15" Type R subwoofer
Stinger 4 Gauge Amp Install Kit
All the speakers in the car are stock.

My first question:
Is there anything I need to buy other then the wiring harness, antenna adapter, and dash kit if I have the amp install kit. I am just confused because I hear bmws need extra adapters or whatever.

Also, this is speaker related. I have all stock speakers. NOT HARMON KARDON SYSTEM. Should I spend the money and buy aftermarket speakers? and if I do will I have to buy any adapters or will it be a direct "Plug and Play".


I APPRECIATE THE TIME YOU ALL TAKE TO ANSWER MY QUESTIONS, HAVE A GREAT DAY I KNOW IM A lol