Here is one car with tons of tuning potential. I spotted this particular 335i up in Hakone when I was shooting the Check Shop M5. It had just been put through its paces by a Japanese magazine and looked particularly attractive with its lowered stance and AC Schnitzer kit. Thanks to some ECU tuning the sequentially turbocharged straight-six was developing close to 400 HP, just 20 HP shy of the high-revving 4L V8 powered M3. It would be interesting to put this tuned 335i up against an M3 to see how the low-end torque of the six-pot would stack up to the top-end power delivery of the 8-cylinder. 

- Dino Dalle Carbonare