I was thinking that style with a horizontal piece, looks very good on the 997 Turbo. And with a larger border at the bottom to give the appearnace that the intake is larger than it acutally is.
The current 986 style in black looks unfinished to me, and the painted ones on the 03-04's look kind of meek. A bit too small against the pronounced flare of the fenders. THe shape could be more fluid, i think the stock intake is the most 'square' element on the exterior of the car.