The supercharged 5.4-litre SLR AMG V8 engine is uprated at . Cobra featured an uprated P&WC T400-WV-402 engine and stronger drivetrain. Later series IIIs had a Rover type front axle with uprated differential. The supercharged V6 was uprated to from the VS. It also features a lowered ride height and chassis and uprated suspension. The SP versions featured Marchesini rims and uprated suspension. The wheelbase was uprated to in the 1949 redesign. The steering rack was swapped out to one with an uprated ratio. Power had been uprated to and torque to . The Vanden Plas gained leather trim and uprated electronic stereo system. An uprated Helix clutch is also used. Many had been uprated with the new 2.2-litre engine. The engine was soon uprated to , but the claimed top speed remained unchanged. Equipped with an uprated engine, this variant was designated "C-101BB-02". Power is provided by uprated General Electric CF6 engines.