Carlsson improves upon the Mercedes SL63 AMG

Not happy with only 518 hp and a 4.5-second 0-to-60-mph time from your shiny new Mercedes-Benz SL63 AMG? Lucky for you, the German tuners from Carlsson are now offering performance-upgrade kits in the United States.

Through GGI European Tuning in Miami--the exclusive North American importer of Carlsson parts--SL63 owners can massage their rides to churn out 600 hp and 520 lb-ft of torque and to handle better than stock. With the changes, Carlsson renames the vehicle the CK63 RS.

To improve power, Carlsson builds on the 6.2-liter V8 engine and adds new engine-control mapping, a sport air filter, a high-flow catalytic converter, upgraded manifolds and a stainless-steel exhaust. The result is an improvement of 82 hp and 55 lb-ft of torque and a 3.9-second 0-to-60-mph time. Carlsson also tweaks the speed limiter to give the CK63 RS a top speed of 202 mph.

Chassis enhancements come from altered programming of the automatic leveling suspension and the addition of a carbon-composite brake system. Six-piston calipers clamp onto 15.7-inch discs in front, while four-piston calipers grab 13.0-inch discs out back. The whole package rides on 20-inch forged wheels wrapped in Pirelli tires.

Completing the package is a titanium graphite matte paint job, scissor doors and interior redone in ultra suede.

Pricing for the CK63 RS kit is $28,000, which is in addition to the $135,835 for a new stock SL63. Carlsson also offers a less powerful CK63 S package with 580 hp and a base CK63 kit with 565 hp, which retail for $10,600 and $6,400, respectively. Get more info at www.ggituning.com.

By Jonathan Wong