It sounds maybe 95% quieter now as a standard induction set up. I can still hear a bit of a flutter when i give it beans but im ok with that. I'll probably fit a diverter valve at some point and vent it into the airbox to completely quieten it.
Took the opportunity too to replace the rather withered looking seal/trim around the charge pipe where it enters the inside wing panel. I purchased one of the Healey Sprite fuel filler seals and it does a good job. It actually fits right around the pipe even though the flange makes it look like there is a gap.
Original Induction set up (with tired looking charge pipe seal):

New seal fitted:

Original Airbox finally back in situ:
