Coming from a 335, I love the M3 bits like the seats, gauges, steering wheel, and especially the way the suspension feels. Not gonna lie though. The torque isn't there for launching like a bat out of hell, but it's still no slouch. When you get past 4k RPM, the power comes on very nicely, but I'm sure you've read that in many reviews and other threads before. A big thing is I wasn't used to the power building all the way to redline, lol. Exhaust sounds a lot better as well
It's a lot more expensive to get extra HP out of 'em, but you don't need many to have fun. I plan on just doing intake, exhaust, and tune for now.... we'll see.