Turned in my 2017 C43 and picked up a customer order M340 couple weeks ago. Took 12 weeks to the day (wtf).
Really enjoyed my C43 but I like the M340 more.
I got the M Performance Exhaust added onto the M340 but the AMG exhaust still tops the M Performance Exhaust by a bit. The C43 had a bit more visceral, unpredictable exhaust note compared to the M.
C43 had a fancier/more upscale interior versus the M340s more sporty/modern interior.
C43 had a great “split top” center console that should just be standard in all cars.
M340 feels a tick faster (quite a bit faster with the JB4) and feels more athletic and sporty on the road. Handles my crap Michigan roads much better (even on 19" rubber versus the C43’s 18" rubber).
Technology on the M340 is a big jump up, but that’s to be expected versus the older C450/C43 tech.
