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Old 02-02-2015, 11:31 AM   #2
RandallNeighbour
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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.
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'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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