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The Sierra has had problems to pass the german "Gütesiegel" certification in terms of sufficient pitchup.(legal) topspeed was set to 70km/h.
To me, it seemed the production Sierras had longer lufflines and lowered sticks than what had been certified...
I once tested a Sierra of my friend,who claimed it to go faster than 100 km/h. I stopped the test at 110...
In the complete speed range, there was basically no bar-pressure ...