A comparison of M3 generations engine sound :
F82 M4
Bmw M4 spy video.mp3
NA V8 M3 (compilation of stock and some aftermarket exhaust)
Car2.mp3
I6 E46 M3
BMW M3 e46.mp3
I6 E36 M3
M3 e36.mp3
E30 4cyl M3
BMW E30.mp3
un-named: high revving V8 with TT. Can you guess ?
Car1.mp3
The sounds speak for themselves but here is my appreciation:
M4 sound --> turbo noises drowning-out and smoothing the engine and exhaust notes. Car just sounds lame. Kind of a sleepy night owl sound.
V8 M3 sound --> V8 grunt, gets better the higher you rev it, solid harmonics, glorious noise
E46: gutural sound, metallic rasp.
E36:
E30:
the last car: Savage. Feral. Vicious. I love it. "Best noise known to man other than a girl moaning!!".