I have had the exact same problem and it was a really bad at 70-75 infact it was really annoying, my front tyres were at 22psi and 24psi, i whacked the air into 30psi as per manual, (im currently 17" box S) and it was better but still not fully gone. I think there is a reason, my wheels were all balanced at OPC and i mentioned this and they found no reason.
mine is an 02 with 31k miles on the clock, never been crashed and full porsche centre service history. so there must be a reason,
James
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Had:
95 Vauxhall Tigra
99 DC2 Honda Integra type R
00 Audi TT 180 coupe
02 DC5 Honda Integra type R
01 Alfa Romeo spider 3.0 V6
01 Honda s2000
03 Audi TT Roadster 225
02 Porsche Boxster S silver/red Rolling on 19's
No w:
http://img.photobucket.com/albums/v4.../mycayman1.jpg
07 Cayman Guards Red/black on 19's
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