I have a old JL 500/1 and a Sun Down Audio 10 inch laying in the garage. The only reason I havent installed it yet is because theres no safe way to secure the box. It weighs 40 pounds.
I traded in my m240i for a A-Spec. The BMW is fast and fun but I never really drove it hard. I traded it in because I got quoted $3200 for a brake job and it wasn't practical for me anymore.