Join Date: Jan 2010
Location: Fountain Valley California
I think owners have been able to prove out whether or not the mufflers may be the main cause of resonance (drone) when cruising along at about 70ish. I'm pretty sure they would go into the manual mode, an selecting an running for a bit in 4th, 5th, and 6th gear, should tell you something about the noise/vibes. Doing this defaults the engine to the V8 mode vs drifting in an out of the 4 cylinder mode. The results may give you the answer. Course if the previous owner(s) had deactivated the 4 cylinder function, forcing the engine to run in the V8 mode all the time, it will need the help from the smarter members on this subject.