Introduced at the 1965 London Motor Show, the DB6 was already a dated design[5] notable as the first model engineered following a factory relocation from Feltham to Newport Pagnell. The DB6 has a resemblance to its predecessor, the DB5; with the most noticeable differences being its wheelbase, side profile, split front and rear bumpers and rear panels incorporating the Kammback tail rear end. The tail, combined with the relocated rear-axle and the 3.75-inch (95 mm) lengthened wheelbase, provide more stability at high speed. Though fashionable – the rear-end Kamm-styled design was similar to the Ferrari 250 – it did not prove popular with conservative, tradition oriented Aston clientele when the DB6 was introduced. Performance was satisfactory: road-tests of the day observed top speed of the Vantage model between 145 mph (233 km/h) to 148 mph (238 km/h), with John Bolster aboard a Vantage spec DB6 reaching a two-way average of 152 mph (245 km/h).[6]