Ah, M-performance makes sense. Fairly certain the M4C I drove just had the updated LCI ZCP exhaust, which is different but barely.The ZCP was equipped with the M performance exhaust, livened the car up a bit without being obnoxious or loud enough to disturb your neighbors. It's a worthy upgrade
B8 RS5 has one of the most comfortable seating positions I have ever been in - comparable to full size luxury sedans, downshifts are amazing, moves very well given the 2 ton weight especially if you can keep it above 5k but that also means you have to really push it on the street to have fun whereas the M4 is slightly more engaging even cruising around town. The Mazi is surprisingly very engaging despite it's size, sounds great, shifts are more DCT like than a lot of cars equipped with DCT but it's 4200-4300lbs, pure GT experience. I test drove a base v6 F-Type as well and felt it was lighter than an M4 which I think it is by ~150 pounds but no "drama", no surprise given it has 75 less HP vs the M4. I took a 718 Cayman S for a spin and didn't click with it, prefer the M4 but want to try a 981 S before crossing Porsche off the list
Keep us posted on your adventures with the M4
I'll update this periodically without a doubt. :beer:
EDIT to mention: I agree the M-performance exhaust is a nice upgrade, but at $4K (a tad less from other non-bmw retailers but not even by $500 in most cases), I simply cannot justify spending that kind of money for sound.