Morning,
Coming from an S2000 with 240bhp, this car feels faster with more torque and more usable power, though I miss the instant throttle response of the S2000. The point I'm making is there's a lot more to it than the peak power, and when people say this car should have X amount of horsepower you're only talking about peak power. I'd be worried than any attempt to achieve X bhp, especially if it was N/A, would end up making the car worse in reality and only serves to claim bragging rights on a rolling road day.
I would like to get rid of the torque dip, replace the DBW with a cable, make it not so lumpy low down and improve the noise. I wouldn't as it stands want it to go any faster, though if I ended up improving suspension, brakes and tyres perhaps it would then seem like it didn't have enough.