[chadillac2000]

To update the situation regarding the aluminum guibo I managed to break in a very short time, after finishing up installing a Fuel-It stage 3 LPFP, Phoenix Racing PI IM, and upgraded fuel lines, I swapped back on my old 103,000 mile old rubber guibo and finally got to drive the car a bit. I did note some ever so slight stress cracks starting to form in the rubber near the bushings on this one before I bolted it back in.

To my pleasant surprise, probably 99% of the NVH was experiencing and blaming on the SMFW immediately remedied themselves after reinstalling the rubber guibo. A night and day difference in vibration, downshifts are now easier to rev match cleanly, and I no longer experience the the "rocking" sensation I was getting when quickly letting off the throttle at most speeds. I'll probably grab a brand new rubber version and install it during my next oil change just to be safe and avoid future problems and vibrations.