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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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