I've been translating a confidential (at the time) tech document from Germany.
Apparently the brief was that they had to use the same ECU in some race versions of the LET, so there's a 'race mode' hidden there. The maps are extended up to 30 psi (FFS!) and all you have to do is bridge two of the ECU's pins.
I'll post scans later on, but it's not gonna make me too popular with the Germans, is it? (maybe it's their dirty little secret for their ripoff versions of 'upgrade chips') lmao