trim designation continued on the full-size Roadmaster station wagons from 1991 to 1996. The Estate name was also applied to the top trim level of the mid-size Century station wagon (sold as the Regal Estate station wagon in 1982 and 1983) and often included exterior woodgrain applique. Like the Roadmaster, the Century Estate continued to be sold through 1996. Production Figures 1991–1996 Buick revived the Roadmaster name with the introduction of the Roadmaster Estate in 1991 not used since 1953. A "Vista Roof" fixed sunroof over the second row seats, was standard, revived from the 1960s Buick Sport Wagon. Initially the Roadmaster Estate used Chevrolet's 5.0 L L03 V8. It was replaced a year later with a 180 hp 5.7L small-block L05 V8 shared by both wagon and sedan. In 1994 both received a modified dual-exhaust version of the advanced Corvette-derived 5.7L sequential point fuel-injection LT1 V8, increasing output to 260 hp and upping performance substantially. The same engine was used on the Impala SS, Chevrolet police interceptors, and the Cadillac Fleetwood, with an aluminum head version on the Corvette C4, Camaro Z-28, and Firebird Trans-AM. A high-performance engine had last been offered on a GM station wagon in 1974. The listed retail price was $21,445 ($ in dollars ) before optional equipment was added. Due to engineering challenges the rear tailgate remained as a swing-away or tailgate to accommodate rear passengers in the optional third row rear facing seat but the glass panel was now hinged at the top instead of retracting into the tailgate assembly which was an approach last used in 1957, and it showed a similar semi-fastback appearance of the 1971–1976 "clamshell" generation. To compensate for the lack of rear ventilation vent windows once again appeared but were only installed at the edge of the rear cargo windows and instead of an integrated wind deflector which in previous generations helped to clear the rear window a rear wiper and washer system was installed as standard equipment. When ordered with the factory towing package, the station wagon could accommodate with the use of a weight-distributing hitch, dual sway controls, setting rear tire pressure to 35 PSI, and disabling the Electronic Level Control. The towing package added 2.93 rear-axle gears and a rear limited-slip differential, heavy-duty cooling system including oil and transmission coolers, and a factory-installed self-leveling rear suspension called Dynaride, which consisting of air shocks, a height