Graeme McDowell has warned his Ryder Cup team-mates to be prepared for some explosive support for the United States at Medinah this week.The Ulsterman made his debut for Europe in the 2008 defeat at Valhalla and admits the atmosphere was very different to that at Celtic Manor two years ago."There's a world of difference between playing in front of your home fans and playing in front of the US fans," he said."Putts that drop in front of your home fans are like a bomb going off - and putts that go in this weekend will be like someone's got the silencer on. It's like a muted applause."I remember Valhalla. The 14th was a very big natural amphitheatre and one of the most intimidating holes as a European."You knew when somebody birdied - you could hear it reverberating around the course."I think 17 (another par three) is going to have the same effect this week."There's something interesting about missing a putt and having the cheers go up. That's something we are not used to as golfers, but it's something you've got to accept this week and I'm looking forward to it."