It kind of excites me that these questions are popping up again... yay for site activity, boo for this questions being answered more times than time itself. There's really no answer to this, and here is why:
We don't know your budget
We don't know your goal (power, fuel efficiency, etc).. you said performance so I assume power.
We don't really know what you've already done to it, other than looking at pictures.
Engine-wise, unless you go turbo, swap motors.. I'd recommend a B18. Then again, we don't know your budget, so if it's high I would recommend a K-swap. Or turbo B18. See why I can't really help you out much? lol
Also, since you said etc., I will consider that as in general. My "in general" comment would be ditch those tail lights.
Good luck!