Got mine at Winslow from Charles. Great guy and very patient. This, I say, because I've been kicking the tires of BMWs since 2018, when I was in the market for an M4/M3, but found out they did not come with AWD.
Got mine at MSRP, but with a few upgrades that I did not care much about and cost around $6K. The reason I jumped on the deal was because I knew I was saving at least $30K for not buying option #1 which was a brand new GT-R. And with the M4, I was getting an upgraded interior, more civilized trany, and a very capable engine (not to mention AWD).
Also, I just installed the PSI mid-pipe myself. Took me about 2hrs. But if anyone is thinking about doing this and has questions, let me know. Sound is definitely louder than stock, but not HOA-eviction louder, IMO. Sound difference seems to be more predominant in low and high RPMs (from inside the cabin). Cruising speeds sounds stay very civilized, which is what I was looking for.
Apologize for going off track here