Computer-controlled active suspension was available as a feature named "Computer Active Technology Suspension" (CATS). Chassis upgrades included tweaked suspension and Brembo brakes. Other changes included the suspension and brakes. There is a new front spoiler and changes to the rear suspension. The XJ uses a leaf spring rear suspension. The AIRMATIC air suspension with electronically controlled damping. Cornering weave tendencies are amplified by degraded damping of the rear suspension. The development of the Watt's linkage rear suspension came first. All Daytonas came with torsion bar heavy duty suspension. To improve handling, a "sport tuned suspension" and strut tower brace were included. Many vehicles also have an independent rear suspension (IRS). The SS-III came with standard "Super Strut Suspension" and side aerodynamic rocker panels. BMW named its new front suspension the Duolever. These had a wheelbase, air suspension and 4.2-litre engines. Most modern vehicles have independent front suspension (IFS).