Chrysler's Multi-Displacement System (MDS) is an automobile engine variable displacement technology.
The system was first offered only on passenger cars, since the heavy demands of trucks would interfere with its operation.
However, it was recalibrated for 2006 and was offered on all seven models, including SUVs and 1500 series trucks, using the 5.7 L engine.
In the Jeep Grand Cherokee with MDS, highway fuel mileage for the V8 is the same as the V6 at 21 mpg (11.2 liters per 100 km).
In order to preserve the characteristic rumble of the V8 engines, Chrysler and Eberspaecher North America designed a special exhaust system for MDS-equipped vehicles.