Bangor manager Garth Scates believes Warrenpoint Town showed the Seasiders a lack of respect, in the original cup tie.
Last Saturday Bangor drew 0-0 with Warrenpoint at Milltown in difficult conditions, which earned the Championship One side a replay back at Clandeboye Park.
Bangor and Barry Gray's Warrenpoint go head to head tonight, with Scates' men looking complete the cup upset.
Scates said: “It's a great opportunity for us to make it into the quarter-finals at the very least.
“We've beat Warrenpoint before, so I don't see why we can't beat them again. To be honest, I don't think they showed us any respect in the first game.
“It looked as if they thought they just had to show up to beat us, which I find very strange because we beat them in the League Cup earlier in the season.
“But we got a 0-0 draw and a replay, so we're still in with a chance. We've got too look forward to this game as we will never get a better chance to progress than this, as an intermediate team.
“We just have to make sure we prepare properly. We're going to give it a go, as there is no point in sitting back. Warrenpoint will enjoy playing on our pitch as they like to pass the ball, much like ourselves.
“We just have to give it a go and enjoy it, otherwise there is no point.”
The winners of tonight's game will face Queen's University at The Dub in the quarter-finals. If Bangor can win, it will mean that there will definitely be a Championship team in the semi-finals.
On Saturday Bangor booked a place in the last eight of the Intermediate Cup with a comprehensive 3-0 win over Larne. The Seasiders are also favourites to lift the Championship title.
Bangor boss Scates is confident that his men can compete on all three fronts.
“The boys are buzzing with both the Irish Cup and the Intermediate Cup to look forward too. We actually haven't played a league game in a month, which is strange, but that's just the way it goes.
“We don't decide the rules or pick the fixtures, so we just take each game as it comes. The momentum is with us and we're quietly confident we can go all the way in the league.
“We've a good bunch of lads here. They're mates off the pitch and they work hard for each other on it. A manager can't ask for much more than that.”