I am confused
You have an 97-03 now...you want an 04...you want to put a 97-03 rear on the 04...you want to know weather to get a WS6 or a GTP?
If that is correct... get the WS6 worth every penny.
Why in the world you would want to put a 97-03 rear or front on an 04 it is beyond any comprehension of mine though.
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S's? Oh it has SS's!!!