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It was suggested at the end of the top albums and songs from 2002 thread that "Ignition (Remix)" was released in 2002 rather than 2003.
I'm pretty sure the regular version of Ignition never saw the light of day as a single. There is a remix to Ignition (Remix). That is, essentially, Ignition (Remix) (Remix featuring Twista). That's everything I know.
AllMusic also lists Ignition (Remix) as a 2002 single, so it looks like it was in fact from 2002.
Regarding promo releases being taken into account at AM: as promos are usually sent to radio stations and music journalists before the official release date, I kinda feel they shouldn't be included. It might confuse things, especially when it comes to albums/songs officially released early in the year while their promos would've been released towards the end of the previous year.
Both versions of the song appear on his 2003 album Chocolate Factory but it seems the remix version was the single version released in 2002.
Source: Wikipedia (http://en.wikipedia.org/wiki/Ignition_(song))