Its not needed when off boost cause there is no risk of det. You have better control of the mix with the spray as you can increase the amount been delivered as needed. Over in the states its what every second evo or subaru that is tuned is using. They have shitty fuel over there something like 91 octance so using the aquamist injection allows them to run a much hotter ignition timing making power that wouldn't be achievable without it. Same can be applied to our 95ron fuel, using these systems will allow better ignition advance of the map without det occuring.
