People have different tolerances to droning. It would only ever be MY opinion on this.
For me, it was an uplift of about 5 to 10%, which is fine to still hear the 'poor' stereo.
It was non-consequential - to me - given the pay-offs of Larini's work on this, in general.
Indeed, when cruising at motorway speeds, the new bass nuance from tickling the accelerator makes this worry redundantfor me, but those who wish to have a quieter car......
If you are near me. then happy to take you on the A3/M25 and get a 2nd impression.