Can you please specify what steps did you do? All of them?

With pleasure! You will see that those changes really have an effect. I'm glad!

Yes, all Nx4 have these problems.

Hi, thank you for your interest and apologies for the delayed response. First, check if the small round rubber pads are optimally positioned. They are located on the edge of the rear hood. They need to be screwed in or out to securely hold the trunk hood; otherwise, it may produce sounds on uneven surfaces. To check this, close the trunk and, with it closed, pull it upward. If it doesn't stay in place, they need to be unscrewed to press against them.

@@toptechreviews9481 Hi, thanks so much for your prompt response… I think I may need to bring it back for the garage to do it… Would this be covered under warranty as it’s only 6 months old, also the automatic lift switch is loose

@@toptechreviews9481 yes I think I’d have to bring it back to the garage to sort this … Is this something they’d do under warranty as it’s only 6 months old

I didn't measure because I made gradual modifications (discovering step by step), and in order to measure the sound now, I would have to disassemble everything, measure, and then reassemble. Plus, there would need to be identical conditions of speed, air currents, angle of incidence of air currents, and exterior traffic noise. What's certain is that two of my friends have applied it to their cars, and they were very satisfied!