I use it on my CX-9 that has been remapped for higher performance with higher flow air-intake. Initially, my engine has pretty bad 'knocking' whenever I put it under heavy acceleration between 4000 to 4500rpm. It slows the car down and renders the remap useless, as the ECU kicks in and dials down the timing due to the knocking. And this is with our RON 97 fuel.

It's been retuned with leaner AFR ratio and advanced ignition timing. Knocking is very audible.

Similar with my S-max. Mine is 1st version at 200hp. So I remapped it to 240hp.

But I get knocking between 2000-3000 rpm with ron 97 fuel as well. For this car, I use ron 97 fuel and add 1 x 1.5 gram dyno tab and that almost completely remove all knocking phenomenon. Only under very special circumstance can knocking be heard. Of course there may be some very minor knocking that cannot be heard by the ear. But engine knocking that can be heard is really not something I want my car to experience on a regular basis.