The phrase "revised chassis" refers to making changes or improvements to the main structure or frame of a vehicle. It means updating or modifying the foundation on which the various components of the vehicle are built. Full definition
Revised chassis tuning and an upgraded brake system means it handles sharper than the original M2. (press.bmwgroup.com)
Apart from increasing the length, the manufacturer will also revise the chassis adding a longer wheelbase and wider tracks. (motorbeam.com)
Underpinning the new car is a heavily revised chassis boasting tracks that have increased by 0.8 inch in width up front and 0.9 at the rear, new wheel carriers and a larger diameter front roll bar. (autoweek.com)