Less vibration, and an overall smoother drive; no less economical. Not transformative but worth it.
Since installing an aftermarket RMM I had been getting a vibration whenever cruising in normal mode on 2 cylinders so had been putting it in sport mode. Added this and now can leave it in normal when I want to cruise quietly along the motorway. Doesn't seem to have any impact on fuel consumption either.
I couldn’t believe my luck when I can across this, turned my ST from a lumpy horrible sounding motor when cruising to how you would expect a burbling ST to sound.