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Old 02-02-2015, 11:31 AM   #2
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Join Date: Jul 2004
Location: Houston, Texas
Posts: 7,240
Your speedo should not need recalibration. The side walls are just taller on the 17's vs the 18s and the circumference should be the same. A quick check with a tape measure will verify this.

You can certainly direct fit the HIDs into the new car, but since it didn't come with HIDs from the factory, they will not self-level the way your old car did nor will they rotate upward to fill in the high beam halogens unless you buy and install the control box for that feature.
'97 Boxster (Black Hole for 42,000 Dead Presidents and counting) - 122k
New motor, transmission, suspension, and on and on and on it goes...
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