I've had a remapped 03 350z and a 06 350z revup with quite a few mods, not exactly a fair comparison but I've just bought 100% stock 05 plate m3 manual coupe. The m3 is easily faster 0-60 in 5 seconds vs 350z 0-60 in 6 seconds, but I miss the centre dials in my 350z. I loved having the digital speedo visable. I can't seem to find a good seating position in the m3 even though i have lumbar support, inflatable bolsters. Digital freeview etc I still miss my 350z
The nav in the m3 is pants even with the latest maps it doesn't know where its going and looks dated. The MPG is down. The handling is twitchy, loses traction at the rear too easily, and Rolls more which doesn't inspire confidence. Its Softer over the Bumps though.
I've found myself looking at my m3 keys and then picking up my brothers z4mc keys on the way out, as although it has the same engine it feels like a proper sports car rather than a fast saloon. Better handling, steering and much more exciting
I felt I had to get an m3 once in my life but i cant see myself keeping it long tbh.
PS 8000RPM is lovely!