[josephvman]

I think you need to start with the radio, and either the Bremen or the Porsche Classic are good choices. The small screen and high price on the Porsche radio wasn't appealing to me, and unless I needed Apple Carplay I'd go with the Breman.

I've spent a fair amount of money on my system, which is now good but not great. It consists of the Bremen with Focal Coaxlal speakers in the doors and Infinity 4x6 in the rear, a JL Audio amp under hte drivers seat, and a compact JBL powered sub under the passenger seat.

After doing this, I realized that the only way to get really good sound in the car is to go with a 6.5" component speaker in the front doors, in addition to the amp and sub. I don't think the rear speakers make much of a difference, and wouldn't do anything back there unless you already have them in your rear deck. The Infinity 4x6 is a cheap and easy drop-in.

A 6.5" front door speaker will require a little modification of the door panel, but it's not too hard to fit a factory style grill and maintain a stock look. You can mount tweeters in the corners underneath the dash if you don't want to put them in the doors.