could satisfy the 3-litre rallying class with a 1.4 times multiplication factor. Valvetrain was DOHC 4 valves per cylinder (20 valves in total) with an oil cooled KKK K27 turbocharger at and Air-to-Air - Längerer & Reich intercooler fed by Bosch LH-Jetronic fuel injection, generating at 6,700 rpm and of torque at 3,700 rpm. The engine was eventually modified to a inline-5 with 10 valves, still generating , but with peak torque lower in the rev-range. In 1989, it was then changed to a inline-five 20-valve DOHC setup generating , now with a top speed of . The Quattro was partially hand-built on a dedicated line. Production totaled 11,452 units from 1980 to 1991, and through this 11 year production there were no major changes in the visual design of the car. For the 1983 model year, the dashboard did away with an analogue instrument cluster now fitted with a green digital liquid crystal display (LCD) electronic instrument cluster. This was later changed in 1988 to an orange LCD electronic instrument cluster. The interior was redesigned in 1984, and featured a new dashboard layout, new steering wheel design, and new centre console design, the switches around the instrument panel were also redesigned. In 1985, the dashboard changed slightly with harder foam and it lost a diagonal stripe, the switches were varied slightly and the diff lock pull knob gave way to a two-position turn knob with volt and oil temp digital readouts. Exterior styling received little modification during the Quattro's production run. Originally, the car had a flat front grille featuring four separate headlamp lenses, one for each of the low and high beam units. This was altered for the 1983 model year with combined units featuring a single lens housing twin reflectors. This was changed again, for the 1985 model year, in what has become known as the 'facelift model' and included such alterations as a new sloping front grille, headlights, and trim and badging changes. The 20V RR Quattro also featured a new three-spoke steering wheel design, leather trim for door arm rests, gloveboxes, centre console and door pockets. There was also a full length leather-wrapped centre console running all the way to the rear seats and 'quattro' script on the interior with partial leather seats. The floor on the driver's side had a bulge due to dual catalytic exhaust setup. The different models may be distinguished by