I have a White Elantra (DUH) it is a GLS although it did not come badged and it came with the GT kenwood deck and I put GT rims on it and vent visors so far
Like I said, they were just doing it because because because. There really is no difference. Hyundai might have shipped them with no GLS then your dealer could have put them on the 03's. Or they could have started later in 2003. Who knows... anyway, it's not very important I don't think.
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