BMW M3 · The E30 Generation

The dossiers

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  M3 Base Car — ~17,970 built; the accessible entry to the range; why RHD examples carry an unpriced premium and what the documentation set must include

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  Evolution I — ~500 cars; the first homologation update; currently the most undervalued of the three Evo variants relative to its production number

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  Evolution II — ~500 cars; revised aerodynamics, first M3 catalyst option; why the ceiling is constrained by Sport Evo money

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  Sport Evolution — ~600 cars; S14B25, 238bhp, widest body; the definitive E30 M3 and the strongest investment position in the range

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  Johnny Cecotto Edition — ~505 cars; base S14B23 mechanics, driver association; why the dashboard plaque is the premium and what happens when it is missing

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  Roberto Ravaglia Edition — ~25 UK RHD cars; 1987 WTCC championship provenance; the scarcity argument the market has not yet fully priced

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  E36 M3: the bridge — ~71,000 built; inline-six replaces S14; why the E36's abundance makes the E30 M3's window definitive

The era

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  BMW Motorsport GmbH and the Group A brief: the division that produced the M3, the regulations that required it, and why the result exceeded the obligation by a factor of nearly four

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  The S14 engine: lineage from the M88/3, the four-cylinder racing logic, and why the 8,200rpm redline was an engineering choice rather than a marketing figure

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  DTM and ETCC: the championships that produced the Ravaglia and Cecotto editions, the competition evolution that drove each Evo update, and the halo effect on road-car values

Buying & ownership

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  Documentation fraud — the conversion of base M3s to Evo specification: what it looks like, how BMW's factory records expose it, and the verification steps that cannot be skipped

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  S14 inspection priorities: timing chain slack, throttle body synchronisation, subframe mount cracking, and gearbox synchromesh — the four items that change the price

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  The documentation minimum: Fahrzeugdaten, Fahrzeugbrief, service history, and edition plaques — what each document proves and what a missing document costs in value

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  Pre-purchase inspection protocol: the specialist network, the chassis-number verification process, and the negotiation deductions for each category of deficiency