Ok so I bought my cube with 80 miles on it brand new and it had this popping noise from front suspension and I took it to dealer they replaced the strut bearings because they have this problem often and that is usually the solution, it didn't work so they called nissan and nissan said to remove the strut relube everything and see what happens and that didn't work so they called nissan again and nissan said they have had this problem on some cubes and they have replaced the whole strut assembly to fix it so now I'm waiting for the dealer to get the struts in so it can be fixed.....anyone with this popping noise should take it in its a nisan problem its not caused from lowering springs or anything some cubes just have bad struts hope this helps