My setup.
The first thing I did was Upgrade the Stock HI Fi Amp to the Match AudioTec Fischer Amp, Model UP 7BMW. You will likely have to run a cable from the head unit for an amp if not already installed.
The next thing I did was upgrade the Under seat Sub woofers with the Match AudioTec Fischer Subs, Model UP W8BMW-S. If your base didn't include subs, you can add a stealth 10" in the rear side pocket of the hatch. Greg did a great job here.
https://f48.bimmerpost.com/forums/sh....php?t=1717151
Front Doors Match UP C42BMW-FRT.2 (Component)
- I ordered the H/K Front Door Frame Moldings to mount the tweeters.
Rear Doors Match UP X4BMW-FRT.2 (Coax)
Center Match UP X4BMW-CTR.3 (Coax)
Once this is all done the Amp will get tuned to the system and car by the Dealer
https://www.audiotec-fischer.de/en/match/