Loudmouth 2's will sound great with the o/r x...so will the powerflo but will be as loud as Flowmasters with stock H....heres some clips
Loudmouth 2+O/R X
http://www.youtube.com/watch?v=aHdm15IDMww
PowerFlos+O/R X(red one)
http://www.youtube.com/watch?v=_NcI9YC_P6w
PowerFlos+O/R X(red one)
http://www.youtube.com/watch?v=z9262MFwBec
Loudmouth 2+Catted X
http://videos.streetfire.net/video/1...5601668c11.htm
IMO in Sound levels from 1-10...10 being the loudest
Loudmouths+O/R X = 10+
Loudmouth 2 + O/R X = 8.5
PowerFlos+O/R X = 6.25