The reason I ask is GM did build a few '04s with the Autocross Option Package, although I know of none that were sold. The package consisted of several appearance enhancements (much like the special appearance package available on the '05) PLUS the LS1 (5.7 Litre V8) with LS6 heads and camshaft making 400 HP. If you truly have one of these cars (and I don't know how many were built) then you do have a rare GTO.
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