Inline with PSA Group policy, the Peugeot 406, launched two years later, used the same floorpan, core structure and engines as the Xantia. The Hydractive suspension system was not carried over, and the 406 utilised a more traditional spring suspension. Sales in the United Kingdom were strong, and even though it was never able to match the volume of British favourites, such as the Ford Mondeo or Vauxhall Vectra, the car did help Citroën establish a strong foothold in the business car market in the United Kingdom. From an engineering perspective, the Xantia's biggest advance was the suspension. From launch, the more expensive models were available with an enhanced version of the XM's Hydractive, Hydractive II or H2, computer controlled version of the hydropneumatic self-leveling suspension. This used extra suspension spheres to allow a soft ride in normal conditions, but taut body control during hard braking, acceleration or cornering. These models feature an innovation first seen on the ZX, and then subsequently fitted to the facelifted XM, a programmed self steer rear axle. On sweeping curves and tight bends alike, the rear wheels turn in line with the front wheels, sharpening responses and adding to driver pleasure. In 1994, the Activa technology was introduced, which is an extension to the Hydractive II suspension, where two additional spheres and two hydraulic cylinders are used together with computer control to eliminate body roll completely. This technology is more broadly known as active suspension, and the Xantia Activa has exceptional road holding comparable to true sports cars. It employs active anti-roll bars. In the magazine "Teknikens Värld's" moose test, published in Swedish, the 1999 V6 Activa still holds the record speed through the manoeuvre, faster than the McLaren 675LT. United Kingdom models of the Activa came fitted with a XU10 2 litre turbocharged engine also fitted to the Citroën XM 2.0CT and Peugeot 605 SRi. It produced 150 bhp and 171 lb ft of torque and was a 'low-blow' type for smooth power delivery rather than outright bhp. The Xantia was the last Citroën vehicle to use a common hydraulic circuit for suspension, brakes and steering like the pioneering Citroën DS. It was also the last Citroën car that used the green LHM hydraulic fluid. Later cars, such as the C5, used LDS instead.