Nate If it has a aluminum flywheel do me a favor. First jack up the car remove stupid little dust sheild and mark two of the friction ring bolts and make a mark on the ring and wheel. Now get in the car and start it a few times and then go back under. Dissimilar metals on the ring and flywheel could have corroded or the 3 little ghey allen heads that secure it could have broke came loose etc. By starting it it may shift enough to see the ring move on the flywheel. Now slowly spin the engine over and check and lay fingers on all 20 or 18 of the missle nuts on the backside. Those screws are like 10-32 and not designed to hold the kinds of loads fidanza engineers put on them. I've thought this was a f up in design since the first one I ever saw. Anytime you replace a friction plate you can see the cupping in the plate and the wear to the inside on the aluminum where it was touching and where it wasn't. I bet the ring is spinning and shifting under load. I bet if you drive it and launch a few times the noise would go away because of thermal expansion of the flywheel. Poor car needs a heated garage.