Mines a 92. Trust me, stock they will not do over 143, 145 at best. This I'm sure is due to some kind of govenor. If anyone knows how to remove it I'd like to know how. BTW Landshark my 80 928 was the 4.5 liter 5 speed (143 Max) quite a bit slower than your 5.0 liter S4.
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