Victory for Wanderers would put them within touching distance of automatic promotion to the Premier League, and Iwelumo told the club's official website: "These sort of games are what it's all about. It's unbelievable how far we've come really.
"If someone had said at the start of the season we'd be here playing Birmingham, five points clear with six games to go, then of course we'd have taken it.
"It shows what we've achieved so far but there is still a lot of football to be played and points to be won. We'll go into the match the same as we have every other one, and that's trying to win it.
"They need the win more than us but we will be going for it as well."