IMO, a six cylinder would be nice! If this car is hoping to compete with BMW 3 series, IS300, etc. it should have a six in it. Not so much for a high HP number, but for the better low end torque it would provide. I think that revving the thing to 5000RPM to just keep up with traffic would be a turnoff on a car like this. If the car was lighter, it would be a different story, but it weighs in the neighborhood of 3100 LB. Try putting 4 people in it, and you would have to rev the crap out of the engine just to merge on the highway. The only problem with that, is that when Honda designed the car for Japan and Europe, it designed it for a 4 banger, not a 6... I'm not sure a 6 would fit. What does everyone think?