I am a very gentle driver no hard acceleration or racing type. I try to drive smoothly and that gives me pleasure.
I own turbo since last 2 months haven't come across any noise or knocking. I always run on ECO mode and use Total High Octane 100%.
I tried to check my Turbo on 2 different occasions. ECO Mode ON, D-Drive, hard acceleration and it knocks for a few seconds as you ease accelerator it vanishes and doesn't bother if you go gently and accelerate no knocking.
ECO Mode Off, S-Drive full floored gas paddle no knock or sound. For me its too much as it goes to 150 in seconds.
Installed after market Racing Pro Chip from Taiwan. Have options of 1 to 5 selectable that increases your HP by 10HP each step, 1 is standard so at 5 you get increase of 40HP. With chip installed position 5 max. S-Drive no knock, but on D Drive it knocks. At position 3 which is 20HP boost D-Drive full acceleration no knocking and of course Eco Mode off.
I am planning to remove the chip and drive it as it is on factory default. And whenever you need hard acceleration you can jump to S-Mode with Eco Off.
I hope that sheds light on some of the questions raised.