In some races I have come 2nd or below, and I was just wondering, to gold the race and have it added to my complete status, do I have to go back into the series and complete the race, or can I complete it outside of the series, as an individual race?
You got a gold in the series, correct? If so, then you can go ahead and do that one race individually... no need to go through the entire series again.
So does that mean the real guy's name is Porsche? (Founder of the company)...anyway, yeh, youth_cycler is definitely right...unless you didn't get gold in the series you don't have to do the series again.