I considered doing this but I decided to install it as soon as we got the vehicle at 30k. I decided I'd rather nip it early and have no potential long term VCM damage than risk having some but not enough to have a repair done since you know the dealers and Honda won't want to touch it unless it had a catastrophic issue.Look to see if the rumble occurs around the time the ECHO light goes on or off. Because it sounds like your VCM. Sensitive drivers can feel it switching from 6 to 4 and back to 6 cylinders. My warranty will be expiring when I git 110,000 miles at which time i plan to install the muzzler which prevents the VCM from activating.