You do realize that Porsche did not even offer 18 inch wheels as an option in 97? They beefed up the suspension in 98 to allow for 18s. Running 19s on a 97 model year car is really not recommended, but I'm not sure if that is the reason you are experiencing shaking at speed.
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Last edited by Boxtaboy; 05-21-2009 at 08:44 PM.
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