The E34 M5 is a continuation of BMW's M5 series, based on the 5-series. It was produced from 1988 to 1995. It was produced at BMW M GmbH in Garching, Germany and like the previous M5, was entirely hand-built. It utilized the 535i chassis which was produced at BMW's Dingolfing plant. Assembly was done either by a single M employee or a team of M employees and generally took about two weeks. It is rumored that the test drivers of the E34 M5 could determine who or what team made each specific M5, due to characteristic quirks of the handbuilt nature of the E34 M5. The engines were also built by hand by BMW M technicians. All of the E34 M5 powerplants were built to 5% of advertised output. In second half of 1991, the engine displacement was increased to 3.8 litres, power was now increased to 250 kW (340 PS; 335 bhp).
Source: Wikipedia, 2012