The Original Z4 was more a competitor towards Porsche boxter than the excisting Z4 is.
Why, because the former was supposed to be it's main rival, and build accordingly.
Now the excisting Z4 however, things were different.
This time around they targeted the SLK as it's main rival, making it less sporty, but more stylish, elegant and refined, hence the roof, and no true M model.
I thought the Z2 was supposed to be the miata/boxter killer?
What BMW needs thought is something SL'ish.
The 6 is not it, BMW needs some more uber premium convertible's!
3 series: E30: 89 BMW 325i, E36: 92 BMW 325iC, 94 BMW 320iC, 96 BMW 320i Convertible, 94 BMW 320iaC, E46: 99 320ia, E90: 06 BMW 318i Le mans, E91: 07 BMW 318dt
5 series: E39: 97 BMW 520ia, 01 BMW 530Dat, E61: 09 520Dat
X: E83: 05 BMW X3 2.0d Sappihre black.