showed a concept GS version of the Regal based on the Opel Insignia OPC and the Vauxhall Insignia VXR. The concept featured a 2.0L, , high-output DOHC I4 turbocharged Ecotec engine, a 6-speed manual transmission and all-wheel drive. The production GS leaves most of the concept specifications intact, but is front-wheel drive. The GS features Buick's Interactive Drive Control System with GS mode, a choice of an FGP Germany F40-6 six-speed manual or Aisin AF-40 (G2) six-speed automatic transmission, high performance brakes with Brembo front calipers and high performance strut (HiPerStrut) front suspension. 19 inch wheels will be standard and 20 inch forged aluminum wheels will be available. The GS is expected to accelerate from 0 to 60 mph (97 km/h) in under 7 seconds. The production version is equipped with GS-only high-output version of the Ecotec 2.0L turbo engine with and of torque. The GM LHU engine used in the GS trim makes 135 hp per liter - Buick's highest specific output ever. The GS went on sale in fall 2011 as a 2012 model. Shanghai GM's locally produced variant of the Regal GS went on sale in China on September 15, 2011. The output of the 2.0L Turbo SIDI engine is , which is about less than the production US-model. The torque is . and the top speed is claimed as . The car is only offered in this case as a front-wheel-drive. There exist also some interior and exterior differences between the American and Chinese models. Sport Touring Edition For 2016, the Regal added a new Sport Touring Edition which included unique 18" aluminum black pocket wheels and a rear lip spoiler. eAssist Beginning in 2011, Buick began offering the eAssist system in the Regal, The 2012 model year Regal is the second GM vehicle to offer eAssist after the 2012 Buick LaCrosse. The eAssist system is standard in the LaCrosse 2.5 L I4, but the eAssist powertrain is optional in the Regal. The eAssist system adds a lithium-ion battery housed in the trunk, along with regenerative braking, engine stop/start, fuel cut-off, grille louvres that close at speed, underbody panels and low-rolling resistance tires. The eAssist system adds up to to the standard 2.4L Ecotec engine during acceleration. Fuel economy for the Regal with eAssist is estimated at city, highway. 2014 Update GM revealed an updated 2014 Regal at the 2013 New York Auto Show. Changes include