for muffler choice get on youtube and go listen to diffrent setups. Listen to cars and trucks as they all have the same motor. I personally like magnaflow turbo mufflers. Once they get most of the glass burnt out they are not too loud at idle but scream at wide open throttle. They have little to no drone while putting around witch is nice too. They will seem really quiet at first but give them time and I think you would be happy in the end.