Together with its existing styling upgrades for both the exterior and the interior of the Smart Fortwo, German tuning house Carlsson presented a performance kit for the Daimler group's smallest model at this week's Geneva Motor Show.

Carlsson's CK10 package for the Fortwo includes a revised engine management system and a sport air filter that help lift the 1.0-liter petrol unit's peak output to 110hp (82kW) and torque to 158Nm (116.5 lb-ft).

Carlsson showed up at the Geneva Salon with a new version of its C25 supercar dubbed Royale. Based on the Mercedes-Benz SL 65 AMG, the heavily customized coupe with the fixed rooftop will be built in a limited run of 25 units. Company officials said six vehicles have already been sold and will be delivered to the customers in 2011. According to Carlsson, each C25 Royale takes six months from order to delivery.