Serpent S811 Plus4 hard-anodised chassis
Serpent now have the Plus4 chassis, that is part of the updated S811 2.1, available as a separate set to allow the upgrade of existing Cobra 811 buggies. The main chassis plate is 4mm longer in the rear to create a more planted rear end on tracks with short bumps and a rough surface. Included with the hard-anodised chassis comes a longer rear centre driveshaft and an updated aluminium rear chassis brace. All parts are also available separately.
Source: Serpent [serpent.com]