[Lucky]

I suggest the following, in order:

1) drain oil, cut open filter element and inspect -- any metal flakes, even the tiniest of silver bits or plastic bits would be a strong indicator of a failing ims. If you see any, don't run the engine any more and proceed to installing the ln ims kit. Otherwise things are likely good good, refill with oil and enjoy.

2) replace front mount. This can absolutely cause unusual noises to be transmitted to the cabin as the engine moves around and if well worn the mount can allow metal to metal contact at certain revs.

There are other items that can produce troubling noises... cv joints, tranny gears, final differential bearings, pilot bearing for the tranny input shaft (but that is usually only heard with clutch depressed), and more... So don't immediately assume ims.

Good luck and report your findings.