5.8L V8 remained an option through 1991. For 1984, the engine received an OBD-1 compliant Ford EEC-IV computer, raising output to 140 hp (155 hp optional). For 1986, the 5.0L V8 underwent further revision, replacing the throttle-body fuel injection intake with a redesigned multiport "Sequential-Fire" system (distinguished by its large cast-aluminum air intake manifold), raising output to 150 hp. A dual-exhaust system was introduced for 1990 as an option (adding 10 hp). For 1991, the 150 hp 5.0L V8 remained standard with the 180 hp 5.8L V8 offered for fleet sales (subject to gas-guzzler taxes) and in Canada; the final American-assembled vehicles sold with a carbureted engine, the latter V8 included the Motorcraft 7200 variable-venturi carburetor in use since 1979. Body When introduced for the 1980 model year, the LTD Crown Victoria was offered in two-door sedan and four-door sedan body styles; a five-door station wagon was offered as the wood-paneled LTD Country Squire. The body underwent a minor roofline revision over the 1979 LTD Landau, distinguished by a brushed-aluminum band covering the B-pillars. A half-length vinyl roof was standard; on fleet vehicles (such as police cars), the vinyl roof was a delete option. For 1981, the sideview mirrors were remounted and relocated rearward. For 1982, Ford phased out FORD lettering on both the grille and trunklid, phasing in the Ford Blue Oval emblem (the grille emblem was offset to the drivers' side). For 1983, the exterior received a revised grille design; the taillamp lenses were also redesigned (distinguished by the deletion of the LTD script). For 1984, a station wagon without woodgrain paneling was introduced, joining the Country Squire. For four door sedans, a "Brougham" full-length vinyl roof with a more formal roofline profile (including a "frenched" rear window) was introduced as an option. For 1985, the dashboard underwent multiple updates. The climate and audio controls were redesigned (the latter, to fit a single-DIN slot); the change led to the retirement of the 8-track cassette and CB radio options. In a major functional upgrade, the controls for the horn were relocated from the turn-signal stalk to the steering-wheel hub. As a running change by the end of the model year, a center brake light was added (on the rear parcel shelf of sedans, below the rear window of station wagons). For 1987, Ford standardized an electronic dashboard clock, tinted glass, and air conditioning (the latter remained offered as a