i have an 09 and have been getting great milage on the highway with the MDS and pretty good in the city. the only time i have noticed any vibration is at higher highway speed such as 80mph i will notice the vibration but i figure that is due to the MDS probably was not designed to operate at those kind of speeds anyway. not realy a problem to me. like some one said before i feel that is just the nature of the beast.
but getting 524mpg /tank and nearly 24mpg is pretty sweet on long road trips.
Belltech 2/4 Drop, Mufflex delete, aFe stage II intake, Pace Edwards Jackrabbit bed cover, Rhino Linings Spray in bed liner, Debadged, Red LED bed lighting, Airlift 1000 kit (part# 60824), Nitto 420s 285/50/20