Edinburgh moved ahead of Ulster last weekend solely on the basis that they have won more games, following a 32-13 triumph over Newport Gwent Dragons.
And Allen, who once attended Methodist College Belfast alongside Ulster trio Luke Marshall, Craig Gilroy and Paddy Jackson, is hoping to open up a gap.
"I am still friendly with them and there have been a few text messages this week," he said. "Everybody there is excited to see me again.
"You don't go six years and not become friendly with your work colleagues and they become your best friends but not for the 80 minutes this weekend.
"It is a fantastic stadium, 18,000 people right beside the pitch with the brass band up the back and everybody singing along to Sweet Caroline or Galway Girl and what have you. It is one of many players' favourite places to play because of that atmosphere.
"Some teams may feel it is hostile but a lot of the boys here have told me it's one of their favourite places to play."
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