It turns out that the only (so far) Mercedes-Benz model created specifically as an AMG, the SLS coupe with gullwing doors, was designed from day one to have either a hard or a soft top. The ’12 SLS Roadster makes its North American debut this fall. If anyone took a look at the tin-top car and thought having hinges in the roof would probably affect its center of gravity, and not in a good way, then this iteration might well be the preferred choice. Extra compensatory bracing has made it only 88 pounds heavier than the coupe and it will still hit a top speed of 187 mph. The triple-layer fabric/magnesium/aluminum/steel roof can be opened or closed on the fly at speeds of up to 31 mph. Creature comforts include a Bang & Olufsen audio system and Benz’s Airscarf feature that sends warm air wafting around the occupants’ necks.