The Huyton-born 21-year-old, cast out at Goodison Park aged just 15, scored in the 3-0 victory which put the Latics into their first semi-final.
He admits he still has a special affection for the Toffees but has moved on since being told he was not good enough to make it at his boyhood club.
"I was there for nine years and was released when I was 15 and it broke my heart to be honest, but I still look out for Everton's results," said McManaman.
"I was there from the age of seven and that was my life at the time so I was gutted when it happened, but you just have to get on with it.
"It was make or break when I left. I either packed it in or went and found another club and Wigan came knocking and I haven't looked back."
Maynor Figueroa, McManaman and Jordi Gomez scored in 202 first-half seconds to secure Saturday's win.
McManaman has yet to make an impact at Barclays Premier League level for Wigan but has scored in his last two FA Cup appearances and is hopeful of repeating the feat at Wembley in the semi-final.
"You dream of it as a kid and I can't wait for it now," he added. "Most games I've scored so I've enjoyed the FA Cup. It is a special competition and everyone is up for it.
"We just have to keep going because if we get to the final anything can happen. I'd be disappointed if I'm not playing at Wembley."
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