I just got the 14" Mufflex kit put on last week. I like it a lot. The Mufflex shop is actually only 20 minutes away from me. When I went to the shop I heard a 5.7 HEMI with the dual exhaust and the 18" kit and it sounded nice, real nice. I was informed however since I have the single side exhaust set up to go with the 14" kit if I wanted it to sound comparable to the dual set up. I don't think that's it's actually as loud as the website states it to be. When the truck is started you can hear a rumble then just a nice tone. Under normal acceleration you can tell it has a aftermarket muffler but it's not that bad at all. When you step on it that's when it's loud. I was playing around with it today and when down shifting gears manually I like that it's a nice sound all the way down, no "popping". I also like that when I asked about the warranty I was told by the owner, lifetime. If I ever have an issue just come in and the will take care of it.
I am actually going to give them a call tomorrow and see what they can do about putting in a new y pipe.
