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Despite the hype, IMS was a very rare issue on pre-2001 Boxsters. The re-design in 2001 is what caused them to fail.
As mentioned above, I would start with maintenance type issues, and make sure the car is up to scratch. And be cautious of desnorkeling if you park outside. Some people have suggested it may allow water to more easily enter the intake, and while it is debatable, I would not take the risk. You will get a much more substantial change in the growl of the car with a new exhaust.
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1999 Ocean Blue Metallic Boxster - blueboxster.com
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