MJF, the factory don't specify when changes have been adopted - take a look at the forum registration to see if the M3Ws known to the forum community which may help with its history. Here's some food for thought in the mean time.
IMHO the NVH kit was a complete waste of development time & has been responsible for generating more clunking noise on its own.
My bevel box has got slightly better with time & mileage plus using Millers oil has helped quieten the scream although its fickle.
The chassis change transformed the car.
The new 1.5mm exhausts have still had to be sleeved to prevent further cracking. (Stage one is my still preferred pipe)
The tail of the car needs a skid plate lower than the beaded tub skirt
Bump steer was removed with the chassis change.
Cockpit sealing needs to be done to prevent road dust & filth entering the cabin.
The rear axel adjusters bend on bumps generating drive-belt adjustment issues & require
Headlights are flimsy, position drift & won't tighten
Voltage regulators requently fail
