Originally Posted by d_jamont
...the rock crusher noises during deceleration and engine braking.
This is the thrashing noise associated with the single mass flywheel. There are many different brands and "levels" of clutch kit that are reported to have this noise when paired with the SMFW. The entire purpose of the D
MFW is to absorb the power pulses that otherwise cause this noise.
Mike @ IPT did a very thorough write-up of this issue here