In this sentence ...
Correct wool velour carpeting is used ("It didn't hold up as well as Porsche would've liked," says Jim, "and they discontinued it after a while") and the restored mahogany dash trim glows with ethereal warmth in direct sunlight.
... even though the parenthetical quote is a complete sentence, I believe it doesn't need a period after "a while" in this case. Am I right? Or should there be a period for the quote itself?