You'll never get agreement on this. But personally I love my SLP Loudmouths. Pretty quiet at idle, but sound very nice when you stomp on the gas. I have a 2007, but am pretty sure they will fit a 2011 too.
I totally agree on you with that one. and The SLP Loudmouth 1`s not 2`s, is obnoxiously loud and raspy. Just cant get enough of that sound