Clemens,
I can't help you with any of the documentation issues but as a past 408 owner I can tell you something about the noise these cars generate, when I bought mine it had two small Arbarth silencers fitted, fine for cruising around Brighton and the traffic light races but awful on the motorway.
I bought a pair of silencers from a company now I think sadly long gone Competition Cars of Hainolt, they sold me a pair of silencers, normally only one fitted to the original car, for a mid 50's Chrysler Imperial, the transformation was unbelievable, almost Rolls Royce in terms of sound output but with a whispering V8 Burble on tick over, if you need to cut the noise down go for something like this.
Geoff.
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