The 986/996 use a potentiometer that is separate from the pedal assembly while the 997/987 cars use a lighter setup where the potentiometer is integrated into the pedal assembly. So even if you had the $$ to throw away, the connectors on the two setups are different so the 987/997 sprintbooster won't work on the 9x6 cars.
-Todd
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Current Cars:
1989 911 Targa
1984 944 Original Owner
1971 911T
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