OK so...
Package arrived today totally baffling the wife since she had not ordered anything and I always get her to order my stuff so nothing was expected.
Installation time.
Locate trim tool 20 - minutes.
Locate 10mm socket - 25 minutes
Fine a suitable towel to drape over everything - 5 minutes
Disassemble trim, remove bolts, drop HU, remove plugs and install adapter, remove amp bypass plug, steal spare fuse from under hood, install fuse, reinstall trim and turn on car - 6 minutes and 37 seconds
OH
MY
FREAKIN'
GOD!!!!!!!!!!!!!!!
It no longer sounds like a tin can filled with marbles! The door speakers now have sound independent of the dash and they are actually woofers again.
If you are on the fence about doing this just do it. Do it now!
So, so so, many thanks to @
FR-S2GT86 , @
oddrelic and anybody else that contributed to this project!