Looks a nice car, but I don't get the engine.
Has it been modified to ROW 2.7 Carrera spec. with MFI? If not, it's just the US Carrera 2.7, the same as the US spec. '74 911S with CIS. Even this is less bhp than the standard ROW 911S w/CIS.
I think tha needs clearing up before anyone gets too excited about "RS" spec.
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'75 911S Targa
'81 BMW Alpina C1 2.3