"I've seen their games on TV, with the chant they do before the game," said England scrum half Youngs.
"But I have never experienced an atmosphere like that at the Millennium Stadium and there were a quite a few Leicester guys with me in that changing room so that experience can hopefully help us going forward.
"When you go to places like Toulon, you have to take the experiences from the England v Wales game in Cardiff or when we played at Clermont.
"You can't be daunted by it - you have got to be inspired by it. It's a great place to play rugby and when you've got such passionate supporters, it's fantastic.
"Going to Sandy Park and then to Franklin's Gardens were two massive games against two very well supported teams and that's what it's going to be like playing against Toulon.
"They've got a tremendous home crowd, a tremendous stadium and a tremendous record there so that was probably good practice for what's around the corner.
"It's fantasy rugby. Whenever you play a French team, you know they're going to be full of class players. Especially when you play teams like Clermont or Toulon, you know they're going to be littered with stars.
"But sometimes it works in your favour. They've got a lot of class, but so have we. We're a good side, we're a well drilled side, we're organised and everyone's on the same page."