Block 15 is the noisiest I'd say although you tend to get the teens who think they're part of a firm up there.
Gets quieter towards the halfway line where you tend to get the older season ticket holders and the ones more concerned with watching the game than getting pissed. Past that you start working towards the kids section which is 23-24.
To be honest now they've closed the other stands off pretty much anywhere has a decent atmosphere.