I got my Shelby's diff back together after my weekend failure and while I was at it I decided to switch my flowmasters for an MBR axel back cuz I could no longer take the raspyness that they produced with my off-road X-pipe.I liked the flows before the x-pipe but after I added it I no longer enjoyed the sound.I had heard the MBR axel back on a couple of GT's with either a stock h pipe or a catted x pipe and liked what I heard so I figured it was worth a try and let me tell you I loved them.No more raspyness just a deep mellow muscle car sound with a nice krackle on de-celleration and no droan at all at any speed. I highly recommend them.