black looks good against the liquid grey, but it's more subtle. If you want flare, maybe red or orange? If you're going with an intake (good idea) choose from the colors available and stick with a theme. This is what I did (all blue parts).
05 D20 ZX3:
F2 CAI, Trubendz 2.5 exhaust, Tom's Tune, Eibach Sportlines, black SVT wheels