I have had both the 18" and the 14" magnaflow muffler swaps. I now have the JBA though. If you want to feel a little more power go with the 18" muffler. I felt some low end loss with the 14". The 14" is not that loud really well compared to the Banks which I had on my 04 Titan. The 14" is loud but not too much as I could have a conversation with whom ever I was driving at the time.
Here is the 18" sound clip. http://media.putfile.com/magnaflow07titan
This is the 14" sound clip. http://s229.photobucket.com/albums/ee53/juanito817/?action=view¤t=14magnaflow.flv
Here is the 18" sound clip. http://media.putfile.com/magnaflow07titan
This is the 14" sound clip. http://s229.photobucket.com/albums/ee53/juanito817/?action=view¤t=14magnaflow.flv