Yes, these cars as well as the 996's are a PITA when it comes to the mid 70's speeds. I just swapped out a used set of modular rims with BBS RS-GT's and brand new N1 Pilots and it's glass smooth up to 74 then it vibrates to about 90 then it smooths out to where it's glass again at 100 and above (don't tell anyone....). They were balanced on a hunter 9700 but it looks like I'll be getting it done again on a different machine, probably the one at the dealer. The have the 9700 and don't charge an arm and a leg for tire work.
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Cogito Ergo Zoom!
I Think, therefore I go fast
Current Porsches:
2004 Cayenne Turbo
2003 Boxster S
Past Porsches:
1989 911 turbo
1981 911SC
1984 944
1973 914
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