Just for the record, the SMG is a BMW system ( standing for Sequential M Gearbox ) not a Mercedes or McLaren component. But what you mean is a hydraulically operated manual.
About the air-brake on the SLR, I'm thinking it's just a trick feature. It has some effect simply because it disturbs smooth air flow over the body of the car, but the SLR would have to be an aircraft for it to have a great effect on forward momentum. A small wing is not going to noticably slow the car from barreling down the road, but the break discs would do that.
__________________ " I've been to the edge. And there I stood and looked down. You know I've lost a lot of friends there baby. I got no time to mess around ..." - VanHalen
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