Duxbury is all the way on the coast just north of Plymouth. Probably too far for you to drive, but the offer still stands. Sturbridge is 100 miles from me. I have not yet joined NSXCA, but I will as soon as I have to buy something expensive. I have to be able to justify to the wife why I need to belong to 2 car clubs (already in the Lotus club). Sound really travels in aluminum which makes this stuff hard to find sometimes. See if you can force the car to make the sound when stationary...bouncing, torquing it up with the brakes on, driving one wheel over a block of wood. If you have an assistant outside the car, they can help narrow down the location. If you get close, grab a stethoscope or a piece of metal tubing. Look for loose or rubbing items in the engine room. You had all the maintainence done, so all kinds of stuff was apart. Could even be a loose or misaligned motor mount. See Larry B's comment the other day regarding a "rod knock" sort of noise.